Help with "Messages without a matching method signature..." issue

[Brad Gibbs]

I read the Newbie Question on a method signature thread from June 4 a  
few times, but, either that isn't the problem I'm having, or I'm not  
understanding the solution...

Any help would be greatly appreciated.

On compile, I get the following warnings:

warning: 'Class2' may not respond to '+sendMSG:toPort:'
warning: (Messages without a matching method signature will be assumed  
to return 'id' and accept '...' as arguments.



And clicking a button produces the following in the Console:

2008-07-22 11:03:06.824 OSX Interface[37304:10b] *** +[Class2  
sendMSG:toPort:]: unrecognized selector sent to class 0x4080



Below is the offending code:

Class 1 - This class provides IBActions, each of which calls the  
sendMSG: toPort: method of Class 2.  The arguments for the methods in  
this class are used to construct NSStrings in Class 2.
Class 2 - The arguments sent from a button in Class 1 provide two  
strings, which are used to compose a new NSString, which is sent to  
another device on the network.


@interface Class1 : NSObject {
}
- (IBAction)powerOn:(id)sender;


@implementation Class1

- (IBAction)powerOn:(id)sender {
        [Class2 sendMSG:@"P1P1" toPort:@"1"];


@interface Class2 : NSObject {
}

- (NSString *)sendString:(NSString *)stringToSend;
- (void)sendMSG:(NSString *)string toPort:(NSString *)port;

@implementation Class2

- (NSString *)sendString:(NSString *)stringToSend {
	NSData *postData = [stringToSend  
dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
	NSString *postLength = [NSString stringWithFormat:@"%d", [postData  
length]];
        
	NSMutableURLRequest *theRequest=[[[NSMutableURLRequest alloc] init]  
autorelease];
        ...
        
	response = [[NSString alloc] initWithData:receivedData  
encoding:NSASCIIStringEncoding];
        return response;
}


- (void)sendMSG:(NSString *)string toPort:(NSString *)port {
        NSString *stringToSend;
	stringToSend = [[NSString alloc]  
initWithFormat:@"method=MSGSend&param1=%@&param2=%@&param3=200", port,  
string];
        NSLog(@"String being sent: %@", stringToSend);
        [self sendString:stringToSend];
}
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