[Solved] pdf.min.js Error: JavaScript runtime error: Unable to get property GlobalWorkerOptions of undefined or null reference

It gives the following errors

JavaScript critical error at line 22, column 4927 in https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.6.347/pdf.min.js\n\nSCRIPT1010: Expected identifier

second error

Unhandled exception at line 180, column 9 in http://localhost:1113/Forms/DisplayFiles.aspx

0x800a138f - JavaScript runtime error: Unable to get property 'GlobalWorkerOptions' of undefined or null reference

Imports System.IO
Imports System.Data
Imports System.Data.SqlClient
Imports System.Configuration
Public Class DisplayFiles
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If Not Me.IsPostBack Then
            BindGrid()
        End If
    End Sub


    Private Sub BindGrid()
        Dim constr As String = ConfigurationManager.ConnectionStrings("SLISConnectionString").ConnectionString
        Using con As New SqlConnection(constr)
            Using cmd As New SqlCommand()
                cmd.CommandText = "SELECT Id, Name FROM tblFiles"
                cmd.Connection = con
                con.Open()
                gvFiles.DataSource = cmd.ExecuteReader()
                gvFiles.DataBind()
                con.Close()
            End Using
        End Using
    End Sub
    Protected Sub Upload(sender As Object, e As EventArgs)
        Dim filename As String = Path.GetFileName(FileUpload1.PostedFile.FileName)
        Dim contentType As String = FileUpload1.PostedFile.ContentType
        Using fs As Stream = FileUpload1.PostedFile.InputStream
            Using br As New BinaryReader(fs)
                Dim bytes As Byte() = br.ReadBytes(CType(fs.Length, Long))
                Dim constr As String = ConfigurationManager.ConnectionStrings("SLISConnectionString").ConnectionString
                Using con As New SqlConnection(constr)
                    Dim query As String = "INSERT INTO tblFiles VALUES (@Name, @ContentType, @Data)"
                    Using cmd As New SqlCommand(query)
                        cmd.Connection = con
                        cmd.Parameters.Add("@Name", SqlDbType.VarChar).Value = filename
                        cmd.Parameters.Add("@ContentType", SqlDbType.VarChar).Value = contentType
                        cmd.Parameters.Add("@Data", SqlDbType.Binary).Value = bytes
                        con.Open()
                        cmd.ExecuteNonQuery()
                        con.Close()
                    End Using
                End Using
            End Using
        End Using
        Response.Redirect(Request.Url.AbsoluteUri)
    End Sub

    <System.Web.Services.WebMethod()>
    Public Shared Function GetPDF(ByVal fileId As Integer) As Object
        Dim bytes As Byte()
        Dim fileName As String, contentType As String
        Dim constr As String = ConfigurationManager.ConnectionStrings("SLISConnectionString").ConnectionString
        Using con As New SqlConnection(constr)
            Using cmd As New SqlCommand()
                cmd.CommandText = "SELECT Name, Data, ContentType FROM tblFiles WHERE Id = @Id"
                cmd.Parameters.AddWithValue("@Id", fileId)
                cmd.Connection = con
                con.Open()
                Using sdr As SqlDataReader = cmd.ExecuteReader()
                    sdr.Read()
                    bytes = DirectCast(sdr("Data"), Byte())
                    contentType = sdr("ContentType").ToString()
                    fileName = sdr("Name").ToString()
                End Using
                con.Close()
            End Using
        End Using

        Return New With {.FileName = fileName, .ContentType = contentType, .Data = bytes}
    End Function
End Class