How do I add classiccontrllerbuilder in pros?

I was reading through the pros API and I found the example, but there are some errors that come. Where am I supposed to include classiccontrollerbuilder and how should I integrate it?

Are you using the okapi namespace? I had that problem before and uncommented this line and everything worked afterwards. There’s a commented line in the main.h file around line 55 that 's

 using namespace okapi;

Try uncommenting it and then saving. If you don’t see it, maybe try writing it in yourself