[Solved] ASP.Net Web API Error: The parameters dictionary contains a null entry for parameter id of non-nullable type System.Int32

Error while trying to display records from the table.

error message

{"Message":"The request is invalid.","MessageDetail":"The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'System.Int32' for method 'System.Web.Http.IHttpActionResult GetAnouncement(Int32)' in 'KABOJJAAPPAPI.Controllers.AnouncementsController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter."}

 This is the code below

Namespace Controllers
    Public Class AnouncementsController
        Inherits System.Web.Http.ApiController

        Private db As New KABOJJAEntities

        ' GET: api/Anouncements
        Function GetAnouncements() As IQueryable(Of Anouncement)
            Return db.Anouncements
        End Function

        ' GET: api/Anouncements/5
        <ResponseType(GetType(Anouncement))>
        Function GetAnouncement(ByVal id As Integer) As IHttpActionResult
            Dim anouncement As Anouncement = db.Anouncements.Find(id)
            If IsNothing(anouncement) Then
                Return NotFound()
            End If

            Return Ok(anouncement)
        End Function        
    End Class
End Namespace