DyNet V1.1

[XuShiqiang9894]

Hi，
when I install Dynet1.1，I encountered a problem。

 ERROR: Command errored out with exit status 1:
   command: /home/xushiqiang/anaconda3/envs/svmrnn/bin/python -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-31z7go6_/dynet_9cbb8ae7d6b44b6f8763a84cf638457c/setup.py'"'"'; __file__='"'"'/tmp/pip-install-31z7go6_/dynet_9cbb8ae7d6b44b6f8763a84cf638457c/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' bdist_wheel -d /tmp/pip-wheel-vj590a3j
       cwd: /tmp/pip-install-31z7go6_/dynet_9cbb8ae7d6b44b6f8763a84cf638457c/
  Complete output (27 lines):
  running bdist_wheel
  running build
  INFO:root:==============================
  INFO:root:CMake path: /usr/bin/cmake
  INFO:root:Make path: /usr/bin/make
  INFO:root:Make flags: -j 4
  INFO:root:Mercurial path: /usr/bin/hg
  INFO:root:C compiler path: /usr/bin/gcc
  INFO:root:CXX compiler path: /usr/bin/g++
  INFO:root:---
  INFO:root:Script directory: /tmp/pip-install-31z7go6_/dynet_9cbb8ae7d6b44b6f8763a84cf638457c
  INFO:root:Build directory: /tmp/pip-install-31z7go6_/dynet_9cbb8ae7d6b44b6f8763a84cf638457c/build/py3.8-64bit
  INFO:root:Library installation directory: /home/xushiqiang/anaconda3/envs/svmrnn/lib/python3.8/site-packages/../../..
  INFO:root:Python executable: /home/xushiqiang/anaconda3/envs/svmrnn/bin/python
  INFO:root:==============================
  cmake version 3.16.3
  
  CMake suite maintained and supported by Kitware (kitware.com/cmake).
  g++ (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0
  Copyright (C) 2019 Free Software Foundation, Inc.
  This is free software; see the source for copying conditions.  There is NO
  warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  
  INFO:root:Creating build directory /tmp/pip-install-31z7go6_/dynet_9cbb8ae7d6b44b6f8763a84cf638457c/build/py3.8-64bit
  INFO:root:Cloning Eigen...
  abort: HTTP Error 404: Not Found
  error: /usr/bin/hg clone https://bitbucket.org/eigen/eigen
  ----------------------------------------
  ERROR: Failed building wheel for dynet

Could you give me some advices?When I used dynet2.1.2, I got 'dynet' has no attribute 'Saveable'