Getting Error while creating the receipt for RMA Order line

HI, I am creating an order line for an existing order with line type as 'RMA' and the flow_status_code of that line is 'Awaiting_Return'

after that i am trying to create a receipt while creating the receipt i am facing the below error

can any body please suggest me how to fix this error

--------------------
|Create RMA interfac
e record failed. |No
 records match your
selection. |Error: E
PC generation failed
|EPC generation is n
ot enabled for curre
nt organization
----------------------------

Regards
-----------
DRK