iOS Stuck on book example using Table View

#import <UIKit/UIKit.h>

@class TableExampleViewController;

@interface TableExampleAppDelegate : NSObject <UIApplicationDelegate> {

}

@property (nonatomic, retain) IBOutlet UIWindow *window;

@property (nonatomic, retain) IBOutlet TableExampleViewController *viewController;

@end

#import <UIKit/UIKit.h>

@interface TableExampleViewController : UIViewController 
<UITableViewDelegate, UITableViewDataSource> // added from book example
{
 
    NSArray *colorNames;
}

@property (nonatomic, retain) NSArray *colorNames;

@end

#import "TableExampleViewController.h"

@implementation TableExampleViewController  // this gives warning incomplete implementation + method in protocol not implemented
@synthesize colorNames;

- (void)dealloc
{
    [colorNames release];
    [super dealloc];
}

//code from book example
// number of rows in the table view
- (NSInteger)tableview:(UITableView *)tableView
numberOfRowsInSection:(NSInteger) section{
    return [self.colorNames count];
}

//code from book example
//change appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc]
                 initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    }
    //config the cell
    cell.textLabel.text = [self.colorNames
                           objectAtIndex:[indexPath row]];
    return cell;  
}

- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
    
    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
    [super viewDidLoad];
    self.colorNames = [[NSArray alloc]
        initWithObjects:@"Red", @"Green", @"Blue", @"Indigo", @"Violet", nil];
    
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    self.colorNames = nil;
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

@end

2011-04-15 01:47:03.531 TableExample[12199:207] -[TableExampleViewController tableView:numberOfRowsInSection:]: unrecognized selector sent to instance 0x4e15ce0
2011-04-15 01:47:03.533 TableExample[12199:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[TableExampleViewController tableView:numberOfRowsInSection:]: unrecognized selector sent to instance 0x4e15ce0'
*** Call stack at first throw:
(
	0   CoreFoundation                      0x00dc15a9 __exceptionPreprocess + 185
	1   libobjc.A.dylib                     0x00f15313 objc_exception_throw + 44
	2   CoreFoundation                      0x00dc30bb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
	3   CoreFoundation                      0x00d32a04 ___forwarding___ + 1124
	4   CoreFoundation                      0x00d32522 _CF_forwarding_prep_0 + 50
	5   UIKit                               0x001d02b7 -[UISectionRowData refreshWithSection:tableView:tableViewRowData:] + 1834
	6   UIKit                               0x001cdd88 -[UITableViewRowData numberOfRows] + 108
	7   UIKit                               0x00081677 -[UITableView noteNumberOfRowsChanged] + 132
	8   UIKit                               0x0008e708 -[UITableView reloadData] + 773
	9   UIKit                               0x0008b844 -[UITableView layoutSubviews] + 42
	10  QuartzCore                          0x016aba5a -[CALayer layoutSublayers] + 181
	11  QuartzCore                          0x016adddc CALayerLayoutIfNeeded + 220
	12  QuartzCore                          0x016530b4 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 310
	13  QuartzCore                          0x01654294 _ZN2CA11Transaction6commitEv + 292
	14  UIKit                               0x000159c9 -[UIApplication _reportAppLaunchFinished] + 39
	15  UIKit                               0x00015e83 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 690
	16  UIKit                               0x00020617 -[UIApplication handleEvent:withNewEvent:] + 1533
	17  UIKit                               0x00018abf -[UIApplication sendEvent:] + 71
	18  UIKit                               0x0001df2e _UIApplicationHandleEvent + 7576
	19  GraphicsServices                    0x00ffa992 PurpleEventCallback + 1550
	20  CoreFoundation                      0x00da2944 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
	21  CoreFoundation                      0x00d02cf7 __CFRunLoopDoSource1 + 215
	22  CoreFoundation                      0x00cfff83 __CFRunLoopRun + 979
	23  CoreFoundation                      0x00cff840 CFRunLoopRunSpecific + 208
	24  CoreFoundation                      0x00cff761 CFRunLoopRunInMode + 97
	25  UIKit                               0x000157d2 -[UIApplication _run] + 623
	26  UIKit                               0x00021c93 UIApplicationMain + 1160
	27  TableExample                        0x00002519 main + 121
	28  TableExample                        0x00002495 start + 53
	29  ???                                 0x00000001 0x0 + 1
)
terminate called after throwing an instance of 'NSException'
Current language:  auto; currently objective-c

//Main where it crashes:

#import <UIKit/UIKit.h>

int main(int argc, char *argv[])
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    int retVal = UIApplicationMain(argc, argv, nil, nil);  // point where it crashes
    [pool release];
    return retVal;
}