Let me share my experience from AEM 6.5 context.Earlier I saw such type of error messages[not exactly the same] during minification in error.log file as Front End team kept saying JS minification wasn't working. I did troubleshoot the issue and defined below steps - 1. AEM 6.5 uses following closure-compiler-v20190121.jar for js minification, also highlighted in below screenshot -2. If I take a closure look , I could see com.google.javascript is part of this closure compiler bundle.3. Next I dow...