This issue is caused by incorrect use of } where fi should be used to properly close if blocks. The script fails during preprocessing due to these syntax errors. Here are the places where this happens ...

Shell script wrapper around the Regina Rexx interpreter that traps and prints syntax and other errors - ajborla/regina-syntax-checker ...

To fix Google Tag Manager script error pop-up in Windows, uninstall MiniTool Partition Wizard, reconfigure Internet Options, or disable apps.