title: No visible @interface for NSString declares the selector decodeFromPercentageEscapeString
body: <p>Don't know what is wrong with the code.
  Error - No visible @interface for NSString declares the selector decodeFromPercentageEscapeString</p>
  
  <pre><code>@interface ReviewViewController () &lt;UITableViewDataSource, UITableViewDelegate, UIViewControllerTransitioningDelegate, ReviewDelegate&gt; {
  
  NSMutableArray* _arrayData;
  int _reviewCount;
  int _requestCount;
  int _returnCount;
  int _totalRowCount;
  UIRefreshControl* _refreshControl; }    
  </code></pre>
  
  <p>This is where it gives me the error:</p>
  
  <pre><code>        NSString* review1 = [dict[@"review"] stringByConvertingHTMLToPlainText];
          NSString* review2 = [review1 stringByConvertingHTMLToPlainText];
  
  
          review1 = [review2 decodeFromPercentEscapeString:review2]; //where the error occurs
  
  
          [cell.labelDescription setText:review1];
  
  
          CGSize size = [cell.labelDescription sizeOfMultiLineLabel];
          CGRect frame = cell.labelDescription.frame;
          cell.labelDescription.frame = frame;
  </code></pre>