asp.net 4.5 custom membership provider configuration throws strange exception [duplicate]

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I use my own custom Membership and Role providers in Since MVC2 and ran into this issue when I migrated from MVC3 to 4.

I created a new project in MVC4 / .net4.5 EF5 and had the miss-fortune to encounter this error.

I managed to fix it by doing the following:

Add this to your webconfig appsettings:

  <appSettings>
    <add key="enableSimpleMembership" value="false"/>
    <add key="autoFormsAuthentication" value="false"/>
  </appSettings>

Add your connection string to your memberships and roles providers if not already set:

<membership defaultProvider="MyMembershipProvider">
  <providers>
    <add name="MyMembershipProvider" type="AMS.WebUI.Infrastructure.CustomMembershipProvider" connectionStringName="EFDbContext" />
  </providers>
</membership>
<roleManager defaultProvider="MyRoleprovider">
  <providers>
    <add name="MyRoleprovider" type="AMS.WebUI.Infrastructure.CustomRoleProvider" connectionStringName="EFDbContext" />
  </providers>
</roleManager>

This resolved the issue for me and I hope it can help you.

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