Can't create environment with requirements.txt

[ec0github]

Try to create environment with python version 3.6, 3.7, 3.8 and 3.9 and requirements.txt

pip install -r requirements.txt
but none of them are successful. The reason is pip can resolve dependencies conflicts between the packages.
try to ignore install the environment with option '--no-deps', installation could be completed but could run any example due to lack of dependencies.

Is there any method to set up the environment?