core data - How to tell why MagicalRecord update failed -

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i trying figure out why failed: 

    [defaultcontext mr_savetopersistentstorewithcompletion:^(bool success, nserror *error) {     if(success)         nslog(@"update successful");     else         nslog(@"update failed: %@", error); }];

i "update failed" nil error... start looking?

i suggest start looking @ repository of issues magicalrecord. don't use it, quick google search mr_savetopersistentstorewithcompletion turned this known issue, and one, hits number 3 , 4. relevant, didn't check versions or else.

you wanted starting place, right ;-).


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