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I tried to install google-cloud-vision library with my bash console like this

pip3.4 install google-cloud-vision

But i got a error like:

[Errno 18] Invalid cross-device link: '/usr/local/lib/python3.4/dist-packages/google/protobuf/init.py' -> '/tmp/pip-1pw9_o56-uninstall/ usr/local/lib/python3.4/dist-packages/google/protobuf/init.py'

During handling of the above exception, another exception occurred:

[Errno 13] Permission denied: '/usr/local/lib/python3.4/dist-packages/google/protobuf/init.py'

I want to run my file with python 3.4 so i used pip3.4 as given in the forums. can anyone explain why this error occurred and what are the remedies

You need to use some special command-line flags to run pip on PythonAnywhere. There's more information on this help page.