title: Call a function from another ViewController found an error
body: <p>Im trying to call a function from another ViewController but everytime I try it send me an error: : unexpectedly found nil while unwrapping an Optional value</p>
  
  <p>the code Im using is something like this. </p>
  
  <pre><code>    FirstViewController one:
  
     func showup(){
       runoutbut.hidden = false
  }
  </code></pre>
  
  <p>And Im calling it from another ViewController with this function:</p>
  
  <pre><code>func go(){
     FirstViewController().showup()
  }
  </code></pre>
  
  <p>and everytime I active it...  the program send me this error...  "unexpectedly found nil while unwrapping an Optional value"</p>
  
  <p>Any idea on how I can fix it?  thanks in advance... </p>