modbus-rtu.err

This is my code (with PIC 18F458) for Modbus RTU Network. I have written by Ccs laguage

*** Error 100 "MODBUS-RTU.c" Line 2(5,61): USE parameter value is out of range   Not a number: PIN_C6
*** Error 128 "MODBUS-RTU.c" Line 4(1,57): A #DEVICE required before this line
      2 Errors,  0 Warnings.