VS 2010 SqlCe Exception "The operation completed successfully"

Hello People I'm having a major Issue. I have created a windows application to display data from a database(sdf file) in a data grid view. The issue is the data table is on a mobile device running on windows CE. Now my desktop and mobile device are connected via activeSync.

I have to two connection strings. One for testing on my local computer and one for connecting to the database on the mobile device

1.casioconnection = "Data Source=Mobile Device\Program Files\VetSystemCE\vet.sdf"
2.developerConnection = "Data Source=C:\Users\Public\Documents\vet.sdf"

here is the code to connect to the data table and display the data in the datagridview.

Dim con As SqlCeConnection
Dim sqlDelete As String
Dim da As SqlCeDataAdapter
Dim DsLocalAnimalTest1 As New DataSet
Dim BindingSourceLocal1 As New BindingSource

Private Sub refreshAnimalTestCasio()
'Define sqlCeConnection
Try
Me.con = New SqlCeConnection()
Me.con.ConnectionString = My.Settings.developerConnection
'Open SqlCeConnection
Me.con.Open()
Catch ex As SqlCeException
MessageBox.Show("sqlCe Error:" & ex.Message)
End Try

'Sql Select statment for sqlCeDataAdapter
Me.sqlString = "SELECT * FROM Table_animalsMobile"

'Define SqlCeDataAdapter
Me.da = New SqlCeDataAdapter(sqlString, con)
Me.DsLocalAnimalTest1.Clear()
Me.da.Fill(Me.DsLocalAnimalTest1, "Table_animalsMobile")
Me.con.Close()

'Define Binding Sources Data Source
'Define which Data table the binding source is connected to
Me.BindingSourceLocal1.DataSource = Me.DsLocalAnimalTest1
Me.BindingSourceLocal1.DataMember = "Table_animalsMobile"

'Define DataGrid
Me.DataGridView5.DataSource = Me.BindingSourceLocal1
End Sub

When I use the "developerConnection" the code works fine but when I use the "casioConnection" to connect to the Casio device the application crashes. It seems to have a problem filling the sqlCeDataAdatper and I get this error SqlCeException: The operation completed successfully. Can anyone help me get around this error