Driving cell with NBUFFX2 pin Q not found

[parthpower]

DCC_Basic/script/dc_script.tcl

Lines 43 to 45 in b7db944

	#FIXIT: Gives error that no pins found for "Q"
	set_driving_cell -lib_cell NBUFFX2 -pin Q \
	[remove_from_collection [all_inputs] [get_ports clk]]

Shows following error

Error: Cannot find the output pin 'Q'. (UID-996)