"Unknown type "Slider"" error, but I already imported JuceHeader.h

MacOSX and iOS
1

I just downloaded JUCE for a college course and I was trying out a plugin my professor wrote (on Windows), but as I was typing his same exact code, which worked for him, I got this error:

Unknown type “Slider”

This error goes away when I add juce::, but it doesn’t make sense considering I already imported JuceHeader and it works on my professor’s code, so there has to be some underlying error.

I’m working on Ventura 13.2.1 and Xcode 14.3

2

There is an option for using namespace juce which can be enabled or disabled. You can enable or disable it in the projucer, but I would consider not using it. That way you can easily distinguish between your code and juce code.