'unknown error' on post iOS sdk

The error I get is 'Unknown Error'

I forgot to add, doing a create post works fine:

[ENAPIRequest POSTWithEndpoint:@"tasteprofile/create" andParameters:parameters andCompletionBlock:
         ^(ENAPIRequest *request) {}];

I get good json data. Deleting a tasteprofile also works well.

doing an update on the tasteprofile inside the iOS sdk fails, though.

In summary, tasteprofile in Echo Nest iOS sdk:

• create: good
• update: fail
• list: fail
• delete: good