The problem is from Theme side. You should contact to them.
Anyway this can be fixed with two alternative solutions.
1. Disable the plugin “UpSolution Core” or
2. Go to “UpSolution Core” plugin directory and moving to
plugins-support/js_composer/ folder open js_composer.js file, add // on line 177 before coding: https://i.imgur.com/OS9U8Zx.png