Visual Composer Logon Problem

Hi

I am trying to login to Visual Composer. I got VC role assigned and last week I could able successfully created a VC Model

Now when I try to Logon into VC after entering User ID & PWD in VC Logonu2026

Its showing me message u201CCannot redirect to the requested application, the redirect attribute is invalid.u201D

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I can logon to Portal not to VC

Please advice on How to proceed

Thanks