I'm sorry, I misunderstood, I thought you were using python 2 and changed to python 3. It appears you kept using python 2 but tried python 3 at one time. Delete the session files in the sessions folder of admin and your application, delete the error files in the errors folder of admin and your application, finally perform a fake migration. The reason you need to do this to stop having errors is that web2py stores pickles in those files and the pickle format is different between 2 and 3 so if you have a pickle generated with python 3 it will cause an error when you try to open it with python 2. You do not need to remove python 3, you just need to be aware of this problem so you delete those files after trying your app with python 3.
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