undefined reference to UARTSend

[lpcware]

Content originally posted in LPCWare by Anish Man Shrestha on Fri Oct 18 02:27:05 MST 2013
I am new to LPCxpresso. I am trying to use uart program in blinky project but there is always the same problem "workspace\blinky1\Debug/../src/blinky_main.c:52: undefined reference to `UARTSend' " can anyone help me..

[lpcware]

Content originally posted in LPCWare by Anish Man Shrestha on Fri Oct 18 02:32:32 MST 2013
also do not know where to define path..