Error: "Item has already been added. Key in dictionary: 'AAD.Forms.dll' Key being added: 'AAD.Forms.dll'." (4374014)

Error: "Item has already been added. Key in dictionary: 'AAD.Forms.dll' Key being added: 'AAD.Forms.dll'."

Error in Web Manager when opening any form:

ERROR (VI.FormBase.ExceptionMgr ) : The type initializer for 'VI.FormProvider.FormManager' threw an exception. System.TypeInitializationException: The type initializer for 'VI.FormProvider.FormManager' threw an exception. ---> VI.FormProvider.Archive.FormManagerException: Configuration of form provider could not be determined! ---> System.ArgumentException: Item has already been added. Key in dictionary: 'AAD.Forms.dll' Key being added: 'AAD.Forms.dll'

This is a product defect (37398).

WORKAROUND

Add the following in the web.config file:

<formarchives>
<add key="DllForms" value="assembly:.\bin\???.Forms*.dll;10" />
<add key="DllCustomForms" value="assembly:.\bin\AE.CustomForms.*.dll;5" />
<!-- Disabled to avoid the error of #37398
<add key="Forms" value="archive:.\bin\???.Forms*.vif;10" />
<add key="CustomForms" value="archive:.\bin\AE.CustomForms.*.vif;10" />
<add key="CommonForms" value="archive:.\bin\Common.Forms*.vif;10" />
 -->
</formarchives>

STATUS

This has been implemented into version 9.3.0 and above. If you require this immediately corrected, please contact Support for a hotfix referencing the defect ID 37398.

37398