AttributeError: 'str' object has no attribute '__bases__' - python

I found a program online to help me learn python better, and I was reading through it when I came accross this error
AttributeError: 'str' object has no attribute '__bases__'
Here is the traceback: https://gist.github.com/2984652f5c4ed99607e286799929a0f1
Could anyone here help me on how to debug/fix my issue? Or at least point me in the right direction?

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Tensor object has no attribute _keras_history

can any one please help me resolve this problem:
AttributeError: 'Tensor' object has no attribute '_keras_history'
I found the code on github.

TypeError: object of type 'NoneType' has no len() ...kindly help me out

model=SmallerVGGNet.build(width=IMAGE_DIMS[1],height=IMAGE_DIMS[0],depth=IMAGE_DIMS[2],classes=len(mlb.classes),finalAct="sigmoid")
TypeError: object of type 'NoneType' has no len() ?
kindly help me out in this
Probably your mlb.classes is not assigned properly and it is None. It is hard to tell more without seeing the rest of the code.

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benchmark = gym.benchmark_spec('Atari40M')
AttributeError: 'module' object has no attribute 'benchmark_spec'
I just got this error for gym-0.10.9. Any idea? Thx
According to this post on GitHub, the function 'benchmark_spec' is no longer supported.

Why do I get a module has no attribute __main__ in ipython parallel gather statement?

This is a related question to this one:
https://stackoverflow.com/questions/27596463/why-do-i-get-a-cannedarray-object-has-no-attribute-pickled-in-ipython-gather
The difference is that now I'm trying to use_dill in ipython parallel and when I try to pull data it gives me an error. I have no idea if the data is ever pushed.
dv['a'] = 1
dv['a'] # <- this gives an error
The error I get is:
*** CompositeError: one or more exceptions from call to method: _pull
[0:apply]: AttributeError: 'module' object has no attribute '__main__'
[1:apply]: AttributeError: 'module' object has no attribute '__main__'
[2:apply]: AttributeError: 'module' object has no attribute '__main__'
[3:apply]: AttributeError: 'module' object has no attribute '__main__'
.... 9 more exceptions ...
I have no idea what is going on, any help is much appreciated.
If you want more info please let me know and I'll add it.
Thank you

AttributeError: 'CustomTreeCtrl' object has no attribute '_imageListNormal' exception

I am getting following exception in wxpython
AttributeError: 'CustomTreeCtrl' object has no attribute '_imageListNormal'
Could you please let me know how to resolve this.This issue is inconsistent.

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