If cobbys feature to create a new API User in Magentos Backend keeps failing, you can try to create a new API User without our feature, by hand.

The way to make a new API-User 'by hand' is as follows:

Then check the API-Role 'cobby' if the user is now part of it

9. Click on the role 'cobby'

13. Go to System -> Configuration -> Services / cobby and enter the new users name under User Name and his password under API-KEY.
14. Click "Save Config"

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