Objective-c – NSTableView Troubles

I'm working on learning Objective-C/Coaoa, but I've seem to have gotten a bit stuck with getting the NSTableView object to work for me. I've followed all the directions, but for some reason I still get this error:

Class 'RobotManager' does not implement the 'NSTableViewDataSource' protocol

Here's my source, tell me what you see is wrong here, I'm about to tear my face off.

RobotManager.h

@interface RobotManager : NSObject {
 // Interface vars
 IBOutlet NSWindow *MainWindow;
 IBOutlet NSTableView *RobotTable;
 NSMutableArray *RobotList;
}

- (int) numberOfRowsInTableView: (NSTableView*) tableView;
- (id) tableView:(NSTableView *) tableView objectValueForTableColumn:(NSTableColumn *)tableColumn row:(int)rowIndex;
@end

RobotManager.m

#import "RobotManager.h"

@implementation RobotManager

-(void) awakeFromNib {
 // Generate some dummy vals
 [RobotList addObject:@"Hello"];
 [RobotList addObject:@"World"];
 [RobotTable setDataSource:self]; // This is where I'm getting the protocol warning
 [RobotTable reloadData];
}

-(int) numberOfRowsInTableView: (NSTableView *) tableView {
 return [RobotList count];
}

-(id) tableView:(NSTableView *) tableView objectValueForTableColumn:(NSTableColumn *)tableColumn row:(int)rowIndex {
 return [RobotList objectAtIndex:rowIndex];
}

@end

I'm running OS X 10.6.1 if that makes any difference. Thanks in advance.