PSPICE-FOR-TI: PSPICE-FOR-TI: Simulation error Pspice for Ti ERROR(ORPSIM-15167):

Dear *,

i'm trying to simulate following circuit but i get an error that parameter In is not defined ??

Also i have no idea where-from is this parameter and where and how to define it ?

--------------- INFO(ORPROBE-3209): Simulation Profile:  SCHEMATIC1-ac_bode ---------------
INFO(ORPROBE-3183): Simulation running...
** Profile: "SCHEMATIC1-ac_bode"  [ D:\\Simulation\Mosfet\opamp_mosfet-PSpiceFiles\SCHEMATIC1\ac_bode.sim ]
Reading and checking circuit
INFO(ORPSIM-16573): AC analysis does not support expression evaluation at each frequency. ABM devices with non-linear operations will be evaluated only at bias point.
ERROR(ORPSIM-15167): Undefined parameter: ln.
Circuit has errors ... run aborted
See output file for details
INFO(ORPROBE-3188): Simulation aborted

Best Regards,
David.