```
- (IBAction)sendMessage:(id)sender
{
    NSString* conversationFile = [@"~/" stringByAppendingPathComponent:@"conversation.txt"];
    BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:conversationFile];

    if (fileExists == FALSE)
    {
        [self doShellScript:@"do shell script \"cd ~/; touch conversation.txt\""];
    }

    NSString *conversationContent = [[NSString alloc] stringWithContentsOfFile:@"~/conversation.txt" encoding:NSUTF8StringEncoding error:NULL];
    NSString *myMessage = [[messageBox stringValue]copy];

    NSString *combinedContent = [NSString stringWithFormat:@"%@ \r\n %@", conversationContent, myMessage];
    [[[myConversationBox textStorage] mutableString] setString: combinedContent];
    [combinedContent writeToFile:@"~/conversation.txt" atomically:YES encoding:NSUTF8StringEncoding error:NULL];

}

```

The above code presents the following error

> 
> 2011-07-07 21:38:08.703
>  iMessages[86493:903]
>  -[NSPlaceholderString stringWithContentsOfFile:encoding:error:]:
>  unrecognized selector sent to instance
>  0x100111690
> 
> 
> 2011-07-07 21:38:08.704
>  iMessages[86493:903]
>  -[NSPlaceholderString stringWithContentsOfFile:encoding:error:]:
>  unrecognized selector sent to instance
>  0x100111690
> 
> 
>