title: Unrecognized selector sent to instance?
body: <p>I created a windows in cocoa application and in window i inserted a text field.
  In text filed I want to insert the "hello world" string. I have tried the code as</p>
  
  <pre><code>[self.textfieldvalue setStringValue:@"Hellow world"];
  </code></pre>
  
  <p>here the textfieldvalue is</p>
  
  <pre><code>@property (weak) IBOutlet NSTextField *textfieldvalue;
  </code></pre>
  
  <p>that code is compiled successfully but when it is running throw the error </p>
  
  <pre><code>[NSWindow setStringValue:]:unrecognized selector sent to instance 0x6080001e1f00
  </code></pre>
  
  <p>Thanks,</p>