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SAM4E-16E Xplained Debugging problems

Posted: Sun Mar 08, 2015 7:22 am
Hi all,
I am New to Arm programming. I have SAM4E16E-Xplained board with me and the following error occurred while I am trying to debug .

Failed to Launch Program
Errror : Could not activate interface, but found DAP with ID 0x2ba01477
This usually indicates that the security bit is set . Please Try to perform a chip erase  to clear the security bit before accessing the device again.

Does any know the reason for this ?
Does any know how to solve this?