Unarchiving problem using NSKeyedUnarchiver

Hello Experts,

I am saving my application's state using NSKeyedArchiver.

NSMutableData *data;
 NSKeyedArchiver *archiver;
 
 data = [NSMutableData data];
 archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
 
 [archiver encodeObject:MyObjectToSave forKey:@"SavedStateKey"];
 [archiver finishEncoding];
 [data writeToFile:@"/tmp/SavedState" atomically:YES];
 NSLog(@"Encoding Done");
 [archiver release];

And Decoding the savedObject by the following code:

 NSData *data;
 NSKeyedUnarchiver *unarchiver;
 
 data = [NSData dataWithContentsOfFile:@"/tmp/SavedState"];
 unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
 MyObjectToSave = [[unarchiver decodeObjectForKey:@"SavedStateKey"] retain];
 [unarchiver finishDecoding];
 [unarchiver release]

The Coding is working fine on the simulator.
When running on the real device, It saves the state successfully but at the decoding time, it gives the following error:

 * -[NSKeyedUnarchiver initForReadingWithData:]: data is NULL

i have tried changing the location to following with no luck.

[data writeToFile:@"SavedState" atomically:YES];

Is there any specific folder in the device, where i need to save the archeived data.


Thanks in advance.