Erro Type mismatch: 'CDate'

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Microsoft VBScript runtime error '800a000d' Type mismatch: 'CDate' /common.asp, line 36

Segue trecho do código:

 

If Session("dtmLastVisit") = "" AND Request.Cookies(strCookieName)("LTVST") <> "" Then[b]LINHA 36[/b]	Session("dtmLastVisit") = CDate(Request.Cookies(strCookieName)("LTVST"))	Response.Cookies(strCookieName)("LTVST") = CDbl(Now())	Response.Cookies(strCookieName).Expires = DateAdd("yyyy", 1, Now())'If the last entry date is not alreay set set it to nowElseIf Session("dtmLastVisit") = "" Then	Session("dtmLastVisit") = Now()End If

Galera como resolvo isso?

 

Abraço

[Mário Monteiro 179]

nao tem uma data armazenadaterá que testar antesIF ISDATE(Request.Cookies(strCookieName)("LTVST")) THENSession("dtmLastVisit") = CDate(Request.Cookies(strCookieName)("LTVST"))END IF