Signature not visible in adobe reader

[ghost]

Hi everyone I'm using this library in an angular application to sign a pdf. The signature is not visible in adobe reader DC but it's visible in foxit reader. I tried adobe reader XI but it's not visible either. When I open the document in pdf xchange viewer I get this error: non critical errors detected in the xref table.

Any ideas what the issue could be?

Here is how I do it:

import { Component } from '@angular/core';
import { plainAddPlaceholder} from 'node_modules/node-signpdf/src/helpers';
import signer from 'node_modules/node-signpdf';

@Component({
  selector: 'sign-page',
  template:  '...',
  styles: []
})
export class SignPageComponent {
  file: File;
  p12: File;

  fileChange(event): void {
    this.file = event.target.files[0];
  }

  uploadP12(event): void {
    this.p12 = event.target.files[0];
  }

  sign(): void {
    const fileReader = new FileReader();
    fileReader.addEventListener('loadend', (evt) => {
      if (evt.target.readyState == FileReader.DONE) {
        let pdfBuffer = Buffer.from(fileReader.result);
        pdfBuffer = plainAddPlaceholder({
          pdfBuffer,
          reason: 'I have reviewed it.',
          signatureLength: 31280,
        });
        fileReader.addEventListener('loadend', (evt) => {
          if (evt.target.readyState == FileReader.DONE) {
            let signatureAsBuffer = Buffer.from(fileReader.result);
            const signedPdf = signer.sign(pdfBuffer, signatureAsBuffer);
          }
        });
        fileReader.readAsArrayBuffer(this.p12);
      }
    });
    fileReader.readAsArrayBuffer(this.file);
  }
}

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