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LAUNCHXL-F2800157: error #10234-D: unresolved symbols remain

Part Number: LAUNCHXL-F2800157
Other Parts Discussed in Thread: C2000WARE

Tool/software:

I have import uart code from sci_ex1_echoback and i'm trying to make a rtos task that runs the uart code. When i attempt ot compile/build i get the following error. 

undefined first referenced
symbol in file
--------- ----------------
F28x_usDelay ./f280015x_sysctrl.obj

error #10234-D: unresolved symbols remain
error #10010: errors encountered during linking; "freertos_ex1_c28x_led_blinky.out" not built

In linked resources c2000ware is properly pointed to and i can see f280015x_examples.h in the includes folder. Why am i still getting this error?

Any help would be amazing.