Help Using Theia Blueprint

So, i want to make a IDE for myself and i stumbled around Theia, looking at it i found Theia Blueprint. Now I cloned the repo, installed all the dependencies and ran the command yarn electron start but Im getting this error, I am new to these technologies so, sorry if i did any thing dumb.

Hey @f4ster thanks for checking out Theia,

looks like the application didn’t compile. Did you run yarn build:dev? There are further build instructions in the project readme.

Thanks!, It worked i guess i skipped that part, my bad.