undeclared identifier

[MysticForgeRider]

hi guys! The idiot with little to no knowledge of programmer: I've got everything running now, and did a test with a SNIPPET that came out as expected: good.

Now I'm trying it with my own plugin, and I'm getting this error while building through Xcode:
REGISTER_STATIC_DSP_LIBRARIES()
{
REGISTER_STATIC_DSP_FACTORY(hise::HiseCoreDspFactory);
REGISTER_STATIC_DSP_FACTORY(duckverbDSP);
}

/Users/Bodi/Documents/HISE Projects/DuckVerb by SoundSloth/Binaries/Source/Plugin.cpp:18:30 Use of undeclared identifier 'duckverbDSP'

You got any idea on how to fix this issue?