While installing the OpenCart module if you found OpenCart error: Modification requires a unique ID code! then it means that either you are missing ModuleUniqueName or there is a conflict with another module unique name.
If you are missing code
If you are missing means, while writing ocmod.xml file you missed to write ModuleUniqueName which we missed most.
Open your "*.ocmod.xml" file of your module you are installing then add following lines inside modification schema:
Module Unique NameLike in our list all opencart module all.install.ocmod.xml contains List_all_Products:
List Out All Products OpenCart 2.3 OCmod 1.0 Rupak Nepali, Webocreation.com List_all_Productshttps://webocreation.com]]> All Products ]]>
If there conflict with another module unique name
Then rename the name within ModuleUniqueName and install it again you will see following:
Similar issues can be The directory containing files to be uploaded could not be found: OpenCart error
Happy successful module installation, you can let me know if you found any issues then we can solve. If you like to read more about the Ocmod then read OCMOD Modification System opencart 2.3
