Fetch failed - unknown scheme while running generatePow

Hey, 

Im running into this error while sending a transaction.

TypeError [Error]: fetch failed
    at node:internal/deps/undici/undici:12443:11 {
  cause: Error: unknown scheme

This occurs into the generatePow, at this line
  worker = new Worker("./generatedPowWorker.cjs");
  
  Any idea whats happening here? I'm out of ideas

Any help would be appreciated, thanks
