cannot load the cookie jar is not a good error message

[Jay R. Wren]

http://stackoverflow.com/questions/41800677/charm-fails-to-create-charm-store-client

Specifying the file that is the cookie jar would be a good start to helping a user diagnose the error message themselves.

[ankitdto]

In the current error message, it would be great if all the possibilities of the failure can also be logged.something like:
Perhaps permission issue, or something1, or something2.