Objective-C: NSMutableString error -

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i keep getting error code, app telling me trying mutate object not mutable. can take , explain doing wrong? thanks.

thisrow = [nsstring stringwithformat:@"%i", startpointx2]; nsmutablestring* setcoordstr = [[nsmutablestring alloc] init]; [setcoordstr appendformat: thisrow];  if(w==1) {     thiscol =  [nsstring stringwithformat:@"%i", endpointy];     [setcoordstr insertstring:thiscol atindex:[setcoordstr length]];  } else {     for(startpointy; startpointy<endpointy+1; startpointy++) {         thiscol =  [nsstring stringwithformat:@"%i", startpointy];         [setcoordstr insertstring:thiscol atindex:[setcoordstr length]];     }  }  nslog(@"%@ ", setcoordstr);

you used appendstring: instead of first appendformat:and insertstring:atindex:


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