objective c - Passing NSData Multiplayer GAme -

i want pass array 1 player player:

this how create it:

nsdata *packet = [nsdata datawithbytes:&_spielescreenshots length:sizeof(_spielescreenshots)];

nsdata. _spielescreenshots array.

how can array in didreceivedata method? possible?

(void)match:(gkmatch *)match didreceivedata:(nsdata *)data fromplayer:(nsstring *)playerid {}

i use create data:

nsdata* data = [nskeyedarchiver archiveddatawithrootobject: self.spielescreenshots];

and in didrecievedata method: nsmutablearray *array = [nskeyedunarchiver unarchiveobjectwithdata:data];

now error:

* terminating app due uncaught exception 'nsinvalidargumentexception', reason: '* -[nskeyedunarchiver initforreadingwithdata:]:

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