Error Jasmine suddenly don't recognize angular components

I'm testing an angular project with jasmine and karma and suddenly when I test don't recognize components that works perfectly: "ERROR: 'NG0304: 'app-carrousel' is not a known element". Or "Failed: this.productservice.getProducts(...).subscribe is not a function"

I don't share code bc doesn't have nothing to do with this, I mean just doesn't recognize things that yesterday yes.