One of the projects I am working on, I have a custom master page being used. Its basically a copy of seattle with some CSS and JS customization.
When I click on Add an app from the settings wheel, I only see the below options.
Even if i search for things like Calendar, Surveys, nothing comes up at all. When I switch the master page back to seattle then, it works fine, I don't see issues with it. So as of now , if i have to add a calendar, I have to switch the master page back to Seattle to make those options appear.
Can someone please help me resolve this, thanks in advance.