Ionic PDFJS Cannot match any routes. URL Segment: 'lib/ui/index.html'

I am trying to open a pdf in my ionic 5 application with the plugin
npm i @ pdftron / pdfjs-express --save
but ionic shows me the error Cannot match any routes. URL Segment: ‘lib / ui / index.html’
please how to correct this error?
my code:


<div class="page">
  <div class="header">Angular sample</div>
  <div #viewer class="viewer"></div>


import { Component, ViewChild, OnInit, ElementRef, AfterViewInit } from '@angular/core';
import WebViewer from '@pdftron/pdfjs-express';

  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
export class AppComponent implements OnInit, AfterViewInit {
  @ViewChild('viewer', { static: false }) viewer: ElementRef;
  wvInstance: any;

  ngAfterViewInit(): void {

      path: '../lib',
      initialDoc: '../files/webviewer-demo-annotated.pdf'
    }, this.viewer.nativeElement).then(instance => {
      this.wvInstance = instance;

  ngOnInit() {



Any updates here? I am facing the same issue. Thank you!

Seeing as how this appears to be commercial software with a restrictive license, the first thing I would do is contact its publisher for support.