Application Startup Failed error

[dharik-arsath]

I am new to h2o and wave. I have tried sample scripts from documentation which is working fine but when I try to execute WAVE APPS using "wave run filename.py" it is throwing Application startup error. What is the problem here?

[mtanco]

Hi @dharik-arsath and welcome to Wave! Could please include the error message that you receive and also the contents of the filename.py file?

Thanks!

[dharik-arsath]

wave run form.py

INFO: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO: Started reloader process [2862] using statreload
INFO: Started server process [2865]
INFO: Waiting for application startup.
ERROR: Traceback (most recent call last):
File "/home/arsath/ineuron_internship/lib/python3.8/site-packages/httpx/_exceptions.py", line 326, in map_exceptions
yield
File "/home/arsath/ineuron_internship/lib/python3.8/site-packages/httpx/_client.py", line 1502, in _send_single_request
(status_code, headers, stream, ext,) = await transport.arequest(
File "/home/arsath/ineuron_internship/lib/python3.8/site-packages/httpcore/_async/connection_pool.py", line 218, in arequest
response = await connection.arequest(
File "/home/arsath/ineuron_internship/lib/python3.8/site-packages/httpcore/_async/connection.py", line 93, in arequest
self.socket = await self._open_socket(timeout)
File "/home/arsath/ineuron_internship/lib/python3.8/site-packages/httpcore/_async/connection.py", line 119, in _open_socket
return await self.backend.open_tcp_stream(
File "/home/arsath/ineuron_internship/lib/python3.8/site-packages/httpcore/_backends/auto.py", line 44, in open_tcp_stream
return await self.backend.open_tcp_stream(
File "/home/arsath/ineuron_internship/lib/python3.8/site-packages/httpcore/_backends/asyncio.py", line 270, in open_tcp_stream
return SocketStream(
File "/home/arsath/anaconda3/lib/python3.8/contextlib.py", line 131, in exit
self.gen.throw(type, value, traceback)
File "/home/arsath/ineuron_internship/lib/python3.8/site-packages/httpcore/_exceptions.py", line 12, in map_exceptions
raise to_exc(exc) from None
httpcore.ConnectError: [Errno 111] Connect call failed ('127.0.0.1', 10101)

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/home/arsath/ineuron_internship/lib/python3.8/site-packages/starlette/routing.py", line 526, in lifespan
async for item in self.lifespan_context(app):
File "/home/arsath/ineuron_internship/lib/python3.8/site-packages/starlette/routing.py", line 467, in default_lifespan
await self.startup()
File "/home/arsath/ineuron_internship/lib/python3.8/site-packages/starlette/routing.py", line 502, in startup
await handler()
File "/home/arsath/ineuron_internship/lib/python3.8/site-packages/h2o_wave/server.py", line 242, in _register
await self._wave.call(
File "/home/arsath/ineuron_internship/lib/python3.8/site-packages/h2o_wave/server.py", line 199, in call
return await self._http.post(
File "/home/arsath/ineuron_internship/lib/python3.8/site-packages/httpx/_client.py", line 1633, in post
return await self.request(
File "/home/arsath/ineuron_internship/lib/python3.8/site-packages/httpx/_client.py", line 1371, in request
response = await self.send(
File "/home/arsath/ineuron_internship/lib/python3.8/site-packages/httpx/_client.py", line 1406, in send
response = await self._send_handling_auth(
File "/home/arsath/ineuron_internship/lib/python3.8/site-packages/httpx/_client.py", line 1444, in _send_handling_auth
response = await self._send_handling_redirects(
File "/home/arsath/ineuron_internship/lib/python3.8/site-packages/httpx/_client.py", line 1476, in _send_handling_redirects
response = await self._send_single_request(request, timeout)
File "/home/arsath/ineuron_internship/lib/python3.8/site-packages/httpx/_client.py", line 1502, in _send_single_request
(status_code, headers, stream, ext,) = await transport.arequest(
File "/home/arsath/anaconda3/lib/python3.8/contextlib.py", line 131, in exit
self.gen.throw(type, value, traceback)
File "/home/arsath/ineuron_internship/lib/python3.8/site-packages/httpx/_exceptions.py", line 343, in map_exceptions
raise mapped_exc(message, **kwargs) from exc # type: ignore
httpx.ConnectError: [Errno 111] Connect call failed ('127.0.0.1', 10101)

ERROR: Application startup failed. Exiting.

[mtanco]

httpx.ConnectError: [Errno 111] Connect call failed ('127.0.0.1', 10101)

This error means that the app was not able to connect to the Wave server. Usually we see this when a Wave server is not running. Do you have the Wave server running on the machine where you are running the wave run form.py command?

You can see how to steps here (scroll up as needed, but specifically running the wave server after downloading it is step 4).
https://wave.h2o.ai/docs/installation#step-4-run

[EzechielKiregha]

Hello @mtanco , I was actually looking for something fun, especially for simplicity. So I fall on this powerful tool as said in the documentation simple but powerful. So I tried it out on my Ubuntu system everything was going great and I even run wave run app that's was amazing,

and all of the sudden, after learning about examples I quickly downloaded them, where things were quiet heavy is to run the tour, so I downloaded the necessary python packages and other dependencies using the command give in the documentation.

And now, I am stuck... I can't run app using wave run app after the wave init.

Here is the ERROR I am encountering when attempting to run wave run --no-reload examples.tour.
`(venv) ezechielwill@ai-lunix:~/wave$ wave run --no-reload examples.tour

---

Welcome to the H2O Wave Interactive Tour!

Go to http://localhost:10101/tour

INFO: Started server process [14259]
INFO: Waiting for application startup.
ERROR: Traceback (most recent call last):
File "/home/ezechielwill/venv/lib/python3.8/site-packages/httpcore/backends/asyncio.py", line 34, in read
return await self._stream.receive(max_bytes=max_bytes)
File "/home/ezechielwill/venv/lib/python3.8/site-packages/anyio/_backends/_asyncio.py", line 1265, in receive
await self._protocol.read_event.wait()
File "/usr/lib/python3.8/asyncio/locks.py", line 309, in wait
await fut
asyncio.exceptions.CancelledError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/home/ezechielwill/venv/lib/python3.8/site-packages/httpcore/_exceptions.py", line 10, in map_exceptions
yield
File "/home/ezechielwill/venv/lib/python3.8/site-packages/httpcore/backends/asyncio.py", line 36, in read
return b""
File "/home/ezechielwill/venv/lib/python3.8/site-packages/anyio/_core/_tasks.py", line 118, in exit
raise TimeoutError
TimeoutError

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/home/ezechielwill/venv/lib/python3.8/site-packages/httpx/_transports/default.py", line 60, in map_httpcore_exceptions
yield
File "/home/ezechielwill/venv/lib/python3.8/site-packages/httpx/_transports/default.py", line 353, in handle_async_request
resp = await self._pool.handle_async_request(req)
File "/home/ezechielwill/venv/lib/python3.8/site-packages/httpcore/_async/connection_pool.py", line 256, in handle_async_request
raise exc
File "/home/ezechielwill/venv/lib/python3.8/site-packages/httpcore/_async/connection_pool.py", line 240, in handle_async_request
response = await connection.handle_async_request(request)
File "/home/ezechielwill/venv/lib/python3.8/site-packages/httpcore/_async/connection.py", line 90, in handle_async_request
return await self._connection.handle_async_request(request)
File "/home/ezechielwill/venv/lib/python3.8/site-packages/httpcore/_async/http11.py", line 116, in handle_async_request
raise exc
File "/home/ezechielwill/venv/lib/python3.8/site-packages/httpcore/_async/http11.py", line 95, in handle_async_request
) = await self._receive_response_headers(**kwargs)
File "/home/ezechielwill/venv/lib/python3.8/site-packages/httpcore/_async/http11.py", line 159, in _receive_response_headers
event = await self._receive_event(timeout=timeout)
File "/home/ezechielwill/venv/lib/python3.8/site-packages/httpcore/_async/http11.py", line 195, in _receive_event
data = await self._network_stream.read(
File "/home/ezechielwill/venv/lib/python3.8/site-packages/httpcore/backends/asyncio.py", line 36, in read
return b""
File "/usr/lib/python3.8/contextlib.py", line 131, in exit
self.gen.throw(type, value, traceback)
File "/home/ezechielwill/venv/lib/python3.8/site-packages/httpcore/_exceptions.py", line 14, in map_exceptions
raise to_exc(exc) from exc
httpcore.ReadTimeout

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/home/ezechielwill/venv/lib/python3.8/site-packages/starlette/routing.py", line 677, in lifespan
async with self.lifespan_context(app) as maybe_state:
File "/home/ezechielwill/venv/lib/python3.8/site-packages/starlette/routing.py", line 566, in aenter
await self._router.startup()
File "/home/ezechielwill/venv/lib/python3.8/site-packages/starlette/routing.py", line 654, in startup
await handler()
File "/home/ezechielwill/venv/lib/python3.8/site-packages/h2o_wave/server.py", line 281, in _register
await self._wave.call(
File "/home/ezechielwill/venv/lib/python3.8/site-packages/h2o_wave/server.py", line 232, in call
return await self._http.post(
File "/home/ezechielwill/venv/lib/python3.8/site-packages/httpx/_client.py", line 1848, in post
return await self.request(
File "/home/ezechielwill/venv/lib/python3.8/site-packages/httpx/_client.py", line 1530, in request
return await self.send(request, auth=auth, follow_redirects=follow_redirects)
File "/home/ezechielwill/venv/lib/python3.8/site-packages/httpx/_client.py", line 1617, in send
response = await self._send_handling_auth(
File "/home/ezechielwill/venv/lib/python3.8/site-packages/httpx/_client.py", line 1645, in _send_handling_auth
response = await self._send_handling_redirects(
File "/home/ezechielwill/venv/lib/python3.8/site-packages/httpx/_client.py", line 1682, in _send_handling_redirects
response = await self._send_single_request(request)
File "/home/ezechielwill/venv/lib/python3.8/site-packages/httpx/_client.py", line 1719, in _send_single_request
response = await transport.handle_async_request(request)
File "/home/ezechielwill/venv/lib/python3.8/site-packages/httpx/_transports/default.py", line 353, in handle_async_request
resp = await self._pool.handle_async_request(req)
File "/usr/lib/python3.8/contextlib.py", line 131, in exit
self.gen.throw(type, value, traceback)
File "/home/ezechielwill/venv/lib/python3.8/site-packages/httpx/_transports/default.py", line 77, in map_httpcore_exceptions
raise mapped_exc(message) from exc
httpx.ReadTimeout

ERROR: Application startup failed. Exiting.
`