2017-06-07, 18:17:50
One of the users has the same issue and asked me for a solution. He had modified the original permalink structure to %slug%.html - of course, that cannot work lol. SimpleCatalog requires more complex structure with a minimum of 3 URL sections: /catalog/category-name/item-name/ by default installation. Please read the documentation on my site, in particular the section "Configuration", thats all already written there.