Error while editing translation page

Questions
1

While editing translation pages in litium BO, i get the following error. I tried editing with 2 users. It worked for one user and it didnt for another user. Both the users are configured with same previlage as of administrator

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Litium version: [6.2.0.0]

2

Are you using any custom edit panel?

3

No. It works for the administrator that created the websites but not for other administrators