Erorr When Running Code

I am getting an error 'Run time error 2001, You canceled the previous Operation'. I don't know where I am makin a mistake in this code. I hope you guys will figure it out.

Private Sub Form_Load()

'On Load of the switchboard check Jobs table for any uncompleted jobs

Dim intStore As Integer

'Count of uncomplete jobs that are past the Expected Completion Date
intStore = DCount("[ID]", "[Sheet2]", "[Follow up date] <=Now() AND [Appointment Reminder] =0")

'If count of uncomplete jobs is zero display switchboard
'Else display message box detailing amount of jobs
'and give the user the option as to whether to view these or not.
If intStore = 0 Then
Exit Sub
Else
If MsgBox("There are " & intStore & " uncompleted jobs" & _
vbCrLf & vbCrLf & "Would you like to see these now?", _
vbYesNo, "You Have Uncomplete Jobs...") = vbYes Then
DoCmd.Minimize
DoCmd.OpenForm "Reminder", acNormal
Else
Exit Sub
End If
End If
End Sub