While creating folder in report servers form in ax 2012 its throwing error

Hello Friends,

Plz,Need small favor from your side..

After installing the reporting services and visual studio tools in ax 2012..I'm able to open the report server in website..

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But while configuring the report server through AX and creating the folder in report server its throwing error..

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Clik here to view.                                         I tried to sovle this problem i couldnt make it up please help me out...:)