Has anyone seen this error mesage how do I fix

I put a site together it has membership I uploaded it to a host  and when I try to log on I get this error message

I if use the site nav link to the login page I get there If I try a link to the login page I get the same error

has anyone run into this what would the work around be

Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.

Please help
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