Error when loading the PDF in a deno notebook

I run the following code for loading a PDF in a deno notebook:

import { RecursiveCharacterTextSplitter } from "";
import { PDFLoader } from "";
import * as parse from 'npm:pdf-parse/lib/pdf-parse.js'

const loader = new PDFLoader("hugo-test.pdf");
const rawCS229Docs = await loader.load();

And I got the following error:

Stack trace:
Error: No PDFJS.workerSrc specified
    at S (
    at Y._initialize (
    at new Y (
    at t (
    at z.parse (
    at async <anonymous>:2:22

Does someone know how to solve this?