regex - RegexKit Category problem -

I'm having some trouble using RegexKit.framework. I have integrated it properly into my project and I I want to use the NSString range methods to get the array of matches from the string. Although I've imported the Framework Xcode, it is complaining that " NSString can not answer" -stringByMatching: ".

In the rows where I get warnings These are:

  NSArray * links = [websiteContent componentsMatchedByRegex: linkRegex]; NSMutableString * titleValue = [Results Stringbymaking: TitleRegs];  

thanks -f