SCK Pin not showing up in TimeQuest

Here's the response I get when I entered the command in the TimeQuest tcl console:

--- Quote Start ---

create_clock -name "SCK" -period 1000 [get_ports sck]

Warning: Ignored filter: sck could not be matched with a port

Warning: Ignored create_clock: Argument <targets> is an empty collection

--- Quote End ---

It's almost like my SCK pin isn't showing up as a valid port.

I already have assigned pins to the various ports on my top level, so for instance, my SCK is on pin 12, and the others (MISO, Bus_Int, etc) are assigned to various other pins around the CPLD. The SCK pin is correctly paired with a clock pin on the CPLD as well.

Any more suggestions with this new information??

Is there any more information I could provide that might help?