Make error output more useful

source/RobotAPI/components/units/RobotUnit/util/introspection/ClassMemberInfo.h

@@ -74,7 +74,7 @@ namespace armarx::introspection
     template<class MemberType>
     ClassMemberInfo<CommonBaseT, ClassT>::EntryConfigurator<ClassT> ClassMemberInfo<CommonBaseT, ClassT>::addMemberVariable(MemberType ClassType::* ptr, const std::string& name)
     {
-        ARMARX_CHECK_EQUAL(0, entries.count(name));
+        ARMARX_CHECK_EQUAL(0, entries.count(name)) << "variable was already added!" << GetKeys(entries);
         entries.add(name, Entry(name, ptr));
         return entries.at(name);
     }