Cadense Orcad 16.3 "Error... D_D1 is undefined" I designed a half wave rectifier circuit using resistor, Vsin and 1N4148 diode with the aid of Cadense Orcad 16.3 version. However, after running the simulation, I got an error message saying that the part D_D1 is undefined. I looked for the initialisation file (ini.file) to see if I can make adjustments, but could not find this file. I looked for it in the C drive (Cadense\Orcad16.3\tools\pspice but its not there. I opened all the files in the pspice and found something that looked like it...with the PSPICE DEMO, LIBPATH etc in it. I corrected the libpath which had $ sign included in it. The simulation still does not work. Can somebody please help me with this problem. What can I do to get it running and not telling me the parts are not defined...even diode.