AttributeError: type object ‘Callable’ has no attribute ‘_abc_registry’

by

Try uninstalling typing:

pip uninstall typing

or downgrading python to 3.6. There seems to be a problem with typing in 3.7

If after that you get:

AttributeError: module ‘typing’ has no attribute ‘_ClassVar’

try pip uninstall dataclasses.

For more info refer to:
https://github.com/RTIInternational/gobbli/issues/10

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