How do i fix my custom mob model

It keeps saying: "Your workspace contains mods that don't work properly.". But all i did was make a model in BlockBench, converted it to a java class file, then used it in mcreator. But then when i add the texture PNG for my kart, I make it ridable, move it in strafes, blah blah, It says "Your workspace contains mods that don't work properly."... When i go to the build log, it says override, error: cannot find symbol and error: method does not override or implement a method from a supertype @Override. Plus, it has 38 errors and it seems to talk about compilers and complies blah blah... Can you help me fix it?