Help with error: "Invalid URI: The format of the URI could not be determined."

[Simon Harris]

I'm trying to access a password protected web service. My code is as
follows:

Dim BS7666 As New bs7666.BS7666 'New instance of my web service
Dim CredCache As CredentialCache = New CredentialCache
Dim WebSvcURL As System.Uri = New System.Uri(BS76 66.Url)
CredCache.Add(W ebSvcURL, "Basic", New NetworkCredenti al("USERNAME",
"PASSWORD", "DOMAIN")) 'This is the line it fails on
BS7666.Credenti als = CredCache
Dim DataSet_bs7666 As New DataSet
DataSet_bs7666 = BS7666.GetAddre sses(CStr(0), "", strPostCode.ToL ower,
BuildingNoOrNam e.ToLower, "", strStreet.ToLow er, 0, 0)

Error:
Invalid URI: The format of the URI could not be determined.
Any help will be much appreciated - I've been struggling with this all
day!
:(
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