Add a new board but i can't add new blocks

I want to add a new board for a robotics kit, I want to add new blocks, for example, to control motors, but when I add new blocks, it starts marking compilation errors when it is run on a local server

What can I do?

Can you detail a little bit more, since you say ‘local server’ … What did you do to set this up? What are the exact errors you are having?