Alexander Komarov added a comment - 2021-04-28 17:23 - edited Additionally: Manually editing config.xml for that job and "Reloading Jenkins Configuration" had no effect, I had to restart Jenkins for the job configuration changes to take effect. I will try this approach next time I need to edit:  https://stackoverflow.com/a/54146660/1735931

Alexander Komarov added a comment - 2021-05-05 17:09 - edited Just noticed that I also cannot save changes to a Scriptler Script (same browser console errors)

Alexander Komarov added a comment - 2021-05-05 17:52 - edited Note that the browser errors suggest that this has to do with Cross-Origin issues, possibly because I'm not using HTTPS. The Cross-Origin-Opener-Policy header has been ignored, because the origin was untrustworthy. It was defined either in the final response or a redirect. Please deliver the response using the HTTPS protocol I've attempted to use the cors-filter plugin , it made no difference.

Alexander Komarov added a comment - 2021-05-05 18:07 - edited Update: this is not a Cross-Origin issue.  I got around the CORS warning (using Chrome flag chrome://flags/#unsafely-treat-insecure-origin-as-secure) but the issue perists:   TypeError: Cannot read property 'hasClassName' of undefined at repeatable.js:159 at Array.forEach (<anonymous>) at behavior.js:116 at Array.forEach (<anonymous>) at behavior.js:111 at Array.forEach (<anonymous>) at Object .applySubtree (behavior.js:93) at Object .apply (behavior.js:76) at behavior.js:71 at window.onload (behavior.js:133) (anonymous) @ behavior.js:119 (anonymous) @ behavior.js:111 applySubtree @ behavior.js:93 apply @ behavior.js:76 (anonymous) @ behavior.js:71 window.onload @ behavior.js:133 window.onload @ behavior.js:133 load (async) addLoadEvent @ behavior.js:132 createSearchBox @ hudson-behavior.js:2547 (anonymous) @ editScript?id=LatestVersionEhcacheX.groovy:11 behavior.js:119 TypeError: Cannot read property 'next' of undefined at findEnd (hudson-behavior.js:890) at hudson-behavior.js:1226 at Array.forEach (<anonymous>) at behavior.js:116 at Array.forEach (<anonymous>) at behavior.js:111 at Array.forEach (<anonymous>) at Object .applySubtree (behavior.js:93) at Object .apply (behavior.js:76) at behavior.js:71