diff --git a/.idea/libraries/Dart_Packages.xml b/.idea/libraries/Dart_Packages.xml
index dde9ac4..8e87c9a 100644
--- a/.idea/libraries/Dart_Packages.xml
+++ b/.idea/libraries/Dart_Packages.xml
@@ -226,6 +226,13 @@
             </list>
           </value>
         </entry>
+        <entry key="validators">
+          <value>
+            <list>
+              <option value="$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/validators-2.0.0+1/lib" />
+            </list>
+          </value>
+        </entry>
         <entry key="vector_math">
           <value>
             <list>
@@ -271,6 +278,7 @@
       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/term_glyph-1.1.0/lib" />
       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/test_api-0.2.11/lib" />
       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/typed_data-1.1.6/lib" />
+      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/validators-2.0.0+1/lib" />
       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/vector_math-2.0.8/lib" />
       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/xml-3.5.0/lib" />
       <root url="file://$USER_HOME$/flutter/bin/cache/pkg/sky_engine/lib" />
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index a7add08..e50e34e 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -2,7 +2,9 @@
 <project version="4">
   <component name="ChangeListManager">
     <list default="true" id="a23023fe-943e-49fb-aaac-72229e9d9f43" name="Default Changelist" comment="">
-      <change beforePath="$PROJECT_DIR$/eight_queens/test/widget_test.dart" beforeDir="false" afterPath="$PROJECT_DIR$/eight_queens/test/widget_test.dart" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/eight_queens/lib/main.dart" beforeDir="false" afterPath="$PROJECT_DIR$/eight_queens/lib/main.dart" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/eight_queens/pubspec.yaml" beforeDir="false" afterPath="$PROJECT_DIR$/eight_queens/pubspec.yaml" afterDir="false" />
     </list>
     <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
     <option name="SHOW_DIALOG" value="false" />
@@ -25,11 +27,11 @@
           </provider>
         </entry>
       </file>
-      <file pinned="false" current-in-tab="true">
+      <file pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/eight_queens/test/widget_test.dart">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="345">
-              <caret line="65" lean-forward="true" selection-start-line="65" selection-end-line="65" />
+            <state relative-caret-position="466">
+              <caret line="73" column="41" selection-start-line="73" selection-start-column="41" selection-end-line="73" selection-end-column="41" />
               <folding>
                 <element signature="e#0#1051#0" expanded="true" />
                 <element signature="e#357#400#0" expanded="true" />
@@ -42,7 +44,7 @@
         <entry file="file://$PROJECT_DIR$/eight_queens/test/eight_test.dart">
           <provider selected="true" editor-type-id="text-editor">
             <state relative-caret-position="405">
-              <caret line="27" lean-forward="true" selection-start-line="27" selection-end-line="27" />
+              <caret line="27" selection-start-line="27" selection-end-line="27" />
               <folding>
                 <element signature="e#1#43#0" expanded="true" />
               </folding>
@@ -50,11 +52,14 @@
           </provider>
         </entry>
       </file>
-      <file pinned="false" current-in-tab="false">
+      <file pinned="false" current-in-tab="true">
         <entry file="file://$PROJECT_DIR$/eight_queens/lib/main.dart">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="-1024">
-              <caret line="48" column="55" lean-forward="true" selection-start-line="48" selection-start-column="55" selection-end-line="48" selection-end-column="55" />
+            <state relative-caret-position="388">
+              <caret line="92" column="43" selection-start-line="92" selection-start-column="43" selection-end-line="92" selection-end-column="43" />
+              <folding>
+                <element signature="e#0#42#0" expanded="true" />
+              </folding>
             </state>
           </provider>
         </entry>
@@ -63,7 +68,7 @@
         <entry file="file://$PROJECT_DIR$/eight_queens/lib/queens.dart">
           <provider selected="true" editor-type-id="text-editor">
             <state relative-caret-position="272">
-              <caret line="68" column="7" lean-forward="true" selection-start-line="68" selection-start-column="7" selection-end-line="68" selection-end-column="7" />
+              <caret line="68" column="7" selection-start-line="68" selection-start-column="7" selection-end-line="68" selection-end-column="7" />
             </state>
           </provider>
         </entry>
@@ -79,7 +84,11 @@
       </file>
       <file pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/eight_queens/pubspec.yaml">
-          <provider selected="true" editor-type-id="text-editor" />
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="360">
+              <caret line="24" column="19" selection-start-line="24" selection-start-column="19" selection-end-line="24" selection-end-column="19" />
+            </state>
+          </provider>
         </entry>
       </file>
     </leaf>
@@ -91,11 +100,12 @@
     <option name="CHANGED_PATHS">
       <list>
         <option value="$PROJECT_DIR$/.github/workflows/main.yml" />
-        <option value="$PROJECT_DIR$/eight_queens/lib/main.dart" />
         <option value="$PROJECT_DIR$/eight_queens/lib/results.dart" />
         <option value="$PROJECT_DIR$/eight_queens/lib/queens.dart" />
         <option value="$PROJECT_DIR$/eight_queens/test/eight_test.dart" />
         <option value="$PROJECT_DIR$/eight_queens/test/widget_test.dart" />
+        <option value="$PROJECT_DIR$/eight_queens/pubspec.yaml" />
+        <option value="$PROJECT_DIR$/eight_queens/lib/main.dart" />
       </list>
     </option>
   </component>
@@ -111,9 +121,9 @@
       </list>
     </option>
   </component>
-  <component name="ProjectFrameBounds">
+  <component name="ProjectFrameBounds" extendedState="6">
     <option name="y" value="23" />
-    <option name="width" value="1047" />
+    <option name="width" value="840" />
     <option name="height" value="1027" />
   </component>
   <component name="ProjectView">
@@ -172,7 +182,11 @@
       </list>
     </option>
   </component>
-  <component name="RunManager" selected="Flutter Test.App with invalid input wont show results widget">
+  <component name="RunManager" selected="Flutter.main.dart">
+    <configuration name="main.dart" type="FlutterRunConfigurationType" factoryName="Flutter" temporary="true" nameIsGenerated="true">
+      <option name="filePath" value="$PROJECT_DIR$/eight_queens/lib/main.dart" />
+      <method v="2" />
+    </configuration>
     <configuration name="App pushes a new view with results" type="FlutterTestConfigType" factoryName="Flutter Test" temporary="true" nameIsGenerated="true">
       <option name="testName" value="App pushes a new view with results" />
       <option name="testFile" value="$PROJECT_DIR$/eight_queens/test/widget_test.dart" />
@@ -183,11 +197,6 @@
       <option name="testFile" value="$PROJECT_DIR$/eight_queens/test/widget_test.dart" />
       <method v="2" />
     </configuration>
-    <configuration name="Main Application tests" type="FlutterTestConfigType" factoryName="Flutter Test" temporary="true" nameIsGenerated="true">
-      <option name="testName" value="Main Application tests" />
-      <option name="testFile" value="$PROJECT_DIR$/eight_queens/test/widget_test.dart" />
-      <method v="2" />
-    </configuration>
     <configuration name="My App has an usable textfield" type="FlutterTestConfigType" factoryName="Flutter Test" temporary="true" nameIsGenerated="true">
       <option name="testName" value="My App has an usable textfield" />
       <option name="testFile" value="$PROJECT_DIR$/eight_queens/test/widget_test.dart" />
@@ -200,11 +209,11 @@
     </configuration>
     <recent_temporary>
       <list>
+        <item itemvalue="Flutter.main.dart" />
         <item itemvalue="Flutter Test.App with invalid input wont show results widget" />
         <item itemvalue="Flutter Test.App pushes a new view with results" />
         <item itemvalue="Flutter Test.My App has an usable textfield" />
         <item itemvalue="Flutter Test.My App has the desired message" />
-        <item itemvalue="Flutter Test.Main Application tests" />
       </list>
     </recent_temporary>
   </component>
@@ -222,9 +231,6 @@
     <servers />
   </component>
   <component name="TestHistory">
-    <history-entry file="passing_a_complete_board_to_the_solver_method_returns_false - 2020.02.17 at 16h 34m 46s.xml">
-      <configuration name="passing a complete board to the solver method returns false" configurationId="FlutterTestConfigType" />
-    </history-entry>
     <history-entry file="passing_a_complete_board_to_the_solver_method_returns_false - 2020.02.17 at 16h 34m 50s.xml">
       <configuration name="passing a complete board to the solver method returns false" configurationId="FlutterTestConfigType" />
     </history-entry>
@@ -252,6 +258,9 @@
     <history-entry file="App_with_invalid_input_wont_show_results_widget - 2020.02.17 at 16h 51m 13s.xml">
       <configuration name="App with invalid input wont show results widget" configurationId="FlutterTestConfigType" />
     </history-entry>
+    <history-entry file="App_with_invalid_input_wont_show_results_widget - 2020.02.17 at 17h 07m 20s.xml">
+      <configuration name="App with invalid input wont show results widget" configurationId="FlutterTestConfigType" />
+    </history-entry>
   </component>
   <component name="TodoView">
     <todo-panel id="selected-file">
@@ -263,12 +272,12 @@
     </todo-panel>
   </component>
   <component name="ToolWindowManager">
-    <frame x="0" y="23" width="1047" height="1027" extended-state="0" />
+    <frame x="0" y="23" width="1680" height="1027" extended-state="6" />
     <editor active="true" />
     <layout>
       <window_info id="Captures" order="0" weight="0.25" />
       <window_info id="Capture Tool" order="1" />
-      <window_info content_ui="combo" id="Project" order="2" visible="true" weight="0.3044776" />
+      <window_info active="true" content_ui="combo" id="Project" order="2" visible="true" weight="0.18681319" />
       <window_info id="Structure" order="3" side_tool="true" />
       <window_info id="Image Layers" order="4" />
       <window_info id="Designer" order="5" />
@@ -276,8 +285,8 @@
       <window_info id="Favorites" order="7" side_tool="true" />
       <window_info anchor="bottom" id="Dart Analysis" order="0" weight="0.32941177" />
       <window_info anchor="bottom" id="TODO" order="1" weight="0.32941177" />
-      <window_info active="true" anchor="bottom" id="Run" order="2" visible="true" weight="0.32941177" />
-      <window_info anchor="bottom" id="Debug" order="3" />
+      <window_info anchor="bottom" id="Run" order="2" weight="0.32941177" />
+      <window_info anchor="bottom" id="Debug" order="3" weight="0.32941177" />
       <window_info anchor="bottom" id="Terminal" order="4" weight="0.32941177" />
       <window_info anchor="bottom" id="Event Log" order="5" side_tool="true" />
       <window_info anchor="bottom" id="Version Control" order="6" weight="0.32941177" />
@@ -318,9 +327,6 @@
   </component>
   <component name="editorHistoryManager">
     <entry file="file://$PROJECT_DIR$/.github/workflows/main.yml" />
-    <entry file="file://$PROJECT_DIR$/eight_queens/pubspec.yaml">
-      <provider selected="true" editor-type-id="text-editor" />
-    </entry>
     <entry file="file://$PROJECT_DIR$/eight_queens/lib/results.dart">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="370">
@@ -338,7 +344,7 @@
     <entry file="file://$PROJECT_DIR$/eight_queens/test/eight_test.dart">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="405">
-          <caret line="27" lean-forward="true" selection-start-line="27" selection-end-line="27" />
+          <caret line="27" selection-start-line="27" selection-end-line="27" />
           <folding>
             <element signature="e#1#43#0" expanded="true" />
           </folding>
@@ -348,24 +354,34 @@
     <entry file="file://$PROJECT_DIR$/eight_queens/lib/queens.dart">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="272">
-          <caret line="68" column="7" lean-forward="true" selection-start-line="68" selection-start-column="7" selection-end-line="68" selection-end-column="7" />
+          <caret line="68" column="7" selection-start-line="68" selection-start-column="7" selection-end-line="68" selection-end-column="7" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/eight_queens/lib/main.dart">
+    <entry file="file://$PROJECT_DIR$/eight_queens/test/widget_test.dart">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="-1024">
-          <caret line="48" column="55" lean-forward="true" selection-start-line="48" selection-start-column="55" selection-end-line="48" selection-end-column="55" />
+        <state relative-caret-position="466">
+          <caret line="73" column="41" selection-start-line="73" selection-start-column="41" selection-end-line="73" selection-end-column="41" />
+          <folding>
+            <element signature="e#0#1051#0" expanded="true" />
+            <element signature="e#357#400#0" expanded="true" />
+          </folding>
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/eight_queens/test/widget_test.dart">
+    <entry file="file://$PROJECT_DIR$/eight_queens/pubspec.yaml">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="345">
-          <caret line="65" lean-forward="true" selection-start-line="65" selection-end-line="65" />
+        <state relative-caret-position="360">
+          <caret line="24" column="19" selection-start-line="24" selection-start-column="19" selection-end-line="24" selection-end-column="19" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/eight_queens/lib/main.dart">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="388">
+          <caret line="92" column="43" selection-start-line="92" selection-start-column="43" selection-end-line="92" selection-end-column="43" />
           <folding>
-            <element signature="e#0#1051#0" expanded="true" />
-            <element signature="e#357#400#0" expanded="true" />
+            <element signature="e#0#42#0" expanded="true" />
           </folding>
         </state>
       </provider>
diff --git a/eight_queens/lib/main.dart b/eight_queens/lib/main.dart
index d23f862..83642c0 100644
--- a/eight_queens/lib/main.dart
+++ b/eight_queens/lib/main.dart
@@ -2,7 +2,7 @@ import 'package:eight_queens/queens.dart';
 import 'package:eight_queens/results.dart';
 import 'package:flutter/material.dart';
 import 'package:progress_dialog/progress_dialog.dart';
-
+import 'package:validators/validators.dart';
 
 void main() => runApp(MyApp());
 
@@ -40,6 +40,7 @@ class MyHomePage extends StatefulWidget {
 class _MyHomePageState extends State<MyHomePage> {
   int _boardSize = 0;
   ProgressDialog pr;
+  bool shouldCheck;
 
   // Create a controller to retrieve data from the TextField
   final boardController = TextEditingController();
@@ -51,11 +52,49 @@ class _MyHomePageState extends State<MyHomePage> {
     super.dispose();
   }
 
+  void _showDialogBuilder(String title, String message) {
+    showDialog(context: context,builder: (BuildContext context){
+      return AlertDialog(
+        title: new Text(title),
+        content: new Text(message),
+        actions: <Widget>[
+          new FlatButton(
+              child: new Text("close"), onPressed: () {
+            setState(() {
+              _boardSize = 0;
+            });
+            Navigator.of(context).pop();
+          })
+        ],
+      );
+    });
+  }
+
+  @override
+  void initState() {
+    // TODO: implement initState
+    setState(() {
+      shouldCheck = true;
+    });
+    super.initState();
+  }
+
   /**
    * Retrieve the board number and pass it to the eight queens controller
    * TODO: Create the Responsible class in Dart
    */
   void _startProcessing() async {
+
+    if(boardController.text.isEmpty){
+      _showDialogBuilder("Empty Textfield", "Please enter a value into the text field");
+      return;
+    }
+
+    if(boardController.text.isNotEmpty && !isNumeric(boardController.text)) {
+      _showDialogBuilder("Non numeric", "Please enter a numeric value into the text field");
+      return;
+    }
+    
     setState(() {
       // This call to setState tells the Flutter framework that something has
       // changed in this State, which causes it to rerun the build method below
diff --git a/eight_queens/pubspec.yaml b/eight_queens/pubspec.yaml
index 216c2f7..0366a86 100644
--- a/eight_queens/pubspec.yaml
+++ b/eight_queens/pubspec.yaml
@@ -20,6 +20,7 @@ dependencies:
   flutter:
     sdk: flutter
   shared_preferences : ^0.5.6
+  validators: ^2.0.0
 
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.