[otrs] Error in PGP keys

Hi, When i click on PGP Keys in the Email Settings panel, i am getting the below error, please suggest on the below error Software error: Can't call method "Check" on an undefined value at ../..//Kernel/Modules/AdminPGP.pm line 314. For help, please send mail to the webmaster (you@example.com), giving this error message and the time and date of the error. Regards Rohit Singh