iphone - Core Data and many Entity -

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i'm newbie , must save "ranking" , "level" of user. create file ranking.xcdatamodel save "ranking" entity name ranking (property rank, name) can save , show it.

but when create entity level (property currentlevel) program crash , show message:

unresolved error error domain=nscocoaerrordomain code=134100 userinfo=0x60044b0 "operation not completed. (cocoa error 134100.)", { metadata = { nspersistenceframeworkversion = 248; nsstoremodelversionhashes = { users = ; }; nsstoremodelversionhashesversion = 3; nsstoremodelversionidentifiers = ( ); nsstoretype = sqlite; nsstoreuuid = "41225ad0-b508-4aa7-a5e2-15d6990ff5e7"; "_nsautovacuumlevel" = 2; }; reason = "the model used open store incompatible 1 used create store"; }

i don't know how save "level" please suggest me.

the problem have saved data based on 1 model, changed model , tried re-open same file.

you need delete saved file (i think, top of head) in ~/user/library/applciationsupport/yourappname directory, unless developing document based application.

then re-run application , re-enter , re-save data.


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