title: "Stop - Calculating Error" Problem with creating an alert on strategy
body: <p>can you help solve this problem ?! I have a strategy and it works well, the problem is that I added some additional input source to it (it is plot from a study script.)</p>
  <pre><code>type = input.source
  </code></pre>
  <p>and when I want to alert it, I receive&quot;  this message, &quot;Stop - Error calculating &quot;, :( what should I do? :raised_hands: :pray:</p>
  <p>answer:
  the problem was related to tradingview, they are trying to solve this issue.</p>