I cannot find where Mageworx dir is...
I didn't install the extension but seems to be called it in my page.. and send an error in the admin page.. in the product details, custom options.
need a help. Thanks
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As you can see from the error message the mageworx customoptions helper class was called somewhere in your code.
You can try to search
helper('mageworx_customoptions') in a whole project and remove it, or you can add a condition to check "is a module installed?" before you are trying to call it's helper class.