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I create a Configuration Profile for VPN in iPhone Configuration Utility but when i try to export that profile i get error on console
*** -[__NSPlaceHolderArray initWithObjects:count:]: attempt to insert nil object from object
I got the solution of this problem by myself.
What i was doing wrong is select sign the profile but i don't have any certificate installed to sign it. So i just select None from drop down menu and the problem has gone.