There are several things that cause this, I've been bitten by two of them.
1) Having two events hooked to the page_load via the Handles clause. Note the Me.load. This appears to be placed sometimes by the IDE.
Private Sub Page_Load(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles MyBase.Load, Me.Load <--eek!
2) This one really threw me. Sometimes an Image control with no URL will cause this. Also, links with blank URLS can also cause this. When diagnosing, substitute in as needed.
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