https://community.appian.com/discussions/f/general/18045/how-to-solve-a-problem-with-being-unable-to-open-an-interfaceAll of the sudden one of my interfaces refuses to open and throws an error (see image). I was able to update the interface yesterday with no problems. Weirdly enough the latest version I can open is form 2 weeks ago. It seems to work fine on the siteen-USTelligent Community 12https://community.appian.com/thread/70986?ContentTypeID=1Fri, 13 Dec 2019 13:18:09 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:eb6f9cb6-417b-4a91-80e9-e485e4b7c5c1Jose H.<p>I was able to fix it. The problem was with a gauge field which broke after upgrading to 19.4 I had something like this:&nbsp;<span>!gaugeField(Primary Text: {text in here}) - 19.4 didn&#39;t like the brackets and crashed but I was able to retrieve the code and fix the problem</span></p><div style="clear:both;"></div>https://community.appian.com/thread/70984?ContentTypeID=1Fri, 13 Dec 2019 08:41:00 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:51569f7a-7f58-4fb7-9312-60763a18e846simonj3483<p>It looks like there is missing data. Check the parameters being passed into the interface and&nbsp;the&nbsp;data that is expected to be retrieved</p><div style="clear:both;"></div>