I'm using magento 2 and I'm trying to add the Google Tag Manager code (noscript and script parts) to my magento 2 installation , what's the best way to do it ?

I found this module to do it https://github.com/magepal/magento2-googletagmanager

But once I enable it and add the code , when I go to my website I get a 404 error

The page you requested was not found, and we have a fine guess why

And is the same even if i try to go to the admin panel , the only way to revert this is to disable the module from the database.

Does anyone has any idea why it acts like that ?