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Error logging into CMS after upgrading to 9.1 Update 1

We are currently performing an upgrade from Sitecore 9.0 Update 1 to Sitecore 9.1 Update 1

We have disabled Sitecore Identity Server and OAuth (whilst investigation additional provisions) by enabling the "Sitecore.Owin.Authentication.Disabler.config" and "Sitecore.Owin.Authentication.IdentityServer.Disabler.config" to use the old ASP.NET Membersip system, however when we attempt to log in we get the following error:

 

 

Has anyone seen this before?