You should not need a directory path. Now... it's important to remember... this call cannot REMOVE a value that is disabled at the server level. For example....
If the server disables module1, module2, and module3... You cannot use a custom value of just module1, module2 so that module3 is enabled. module3 would remain disabled. The directive is designed to ADD additional modules to the deny list, not remove them from it. 🙂