I've populated and array with data like this in one class...

PowerClass.h 

NSMutableArray pickerArray;
@property (nonatomic, retain) NSMutableArray pickerArray;

-

PowerClass.m

@synthesize pickerArray;

@implementation
NSMutableArray *array = [[NSArray alloc] initWithObjects:@"stef", @"steve", @"baddamans", @"jonny", nil];
pickerArray = [NSMutableArray arrayWithArray:array];

And I'm trying to set the Array in another class

WeekClass.h

PowerClass          *powerClass;
NSMutableArray  *pickerData;

@property (nonatomic, retain) NSMutableArray pickerData;
@property (nonatomic, retain) PowerClass *powerClass;

WeekClass.m

@implementation
pickerData = [NSMutableArray arrayWithArray:powerClass.pickerArray];

I have no errors or warnings. It just crashes. The NSLog says that the powerClass.pickerArray is NULL.

Please help point me in the right direction.