Im trying to make a plugin and everything works but I recieve this message even though i have nowhere EditorTheme in my code. Also this message is apparently un-googllable. I never try to instanciate EditorTheme directly anywhere, what could be the reason?

Godot 4.2.2

godot src says this is the error definition #define ERR_FAIL_NULL_V_MSG(m_param, m_retval, m_msg) ... and m_param is null. it is called like that ERR_FAIL_NULL_V_MSG(ti->creation_func, nullptr, "Class '" + String(p_class) + "' or its base class cannot be instantiated.");. Now what is ti->creation_func?