When uploading a pdf file, I get Warning: Unimplemented widget field type "null", falling back to base field type at pdf.worker.js. The file is not loading.
I'm using the chrome browser. All other files are processed fine, but this one is not. Help solve the problem.
[usn2020.pdf](https://github.com/mozilla/pdf.js/files/5936611/usn2020.pdf)

return null;
  }
  /**
   * Reset the annotation.
   *
   * This involves resetting the various streams that are either cached on the
   * annotation instance or created during its construction.
   *
   * @public
   * @memberof Annotation
   */
  reset() {
    if (
      (typeof PDFJSDev === "undefined" ||
        PDFJSDev.test("!PRODUCTION || TESTING")) &&
      this.appearance &&
      !this._streams.includes(this.appearance)
    ) {
      unreachable("The appearance stream should always be reset.");
    }
    for (const stream of this._streams) {
      stream.reset();
    }
  }
}
/**
 * Contains all data regarding an annotation's border style.
 */
class AnnotationBorderStyle {