can anyone help me i am trying to use diode 1n4002 in my circuit but easy eda cannot simulate it. here the result of the simulation. ********************** Circuit: good* no system model for 1n4002-e3/54, you can create a model by yourself Error on line 7 : d6 0 volprobe2 1n4002-e3/54 Unable to find definition of model 1n4002 - default assumed unknown parameter (-e3) Error on line 8 : d5 volprobe2 c1_1 1n4002-e3/54 Unable to find definition of model 1n4002 - default assumed unknown parameter (-e3) Error on line 9 : d4 0 0 1n4002-e3/54 Unable to find definition of model 1n4002 - default assumed unknown parameter (-e3) Error on line 10 : d3 0 v1_1 1n4002-e3/54 Unable to find definition of model 1n4002 - default assumed unknown parameter (-e3) Error on line 11 : d2 v1_1 volprobe2 1n4002-e3/54 Unable to find definition of model 1n4002 - default assumed unknown parameter (-e3) errors/warnings in your design, please fix them if you need errors/warnings in your design, please fix them if you need. Doing analysis at TEMP = 27.000000 and TNOM = 27.000000 Warning: v1: no DC value, transient time 0 value used Warning: singular matrix: check nodes u1_3 and u1_3 Note: Starting dynamic gmin stepping Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Warning: singular matrix: check nodes u1_3 and u1_3 Warning: Dynamic gmin stepping failed Note: Starting source stepping Warning: singular matrix: check nodes u1_3 and u1_3 Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful gmin step Note: One successful source step Warning: singular matrix: check nodes u1_3 and u1_3 Warning: singular matrix: check nodes u1_3 and u1_3 Warning: source stepping failed Transient solution failed - Last Node Voltages ------------------ Node Last Voltage Previous Iter ---- ------------ ------------- v1_1 0 6.17217e-90 volprobe2 -1.59638e-77 -2.10731e-89 c1_1 6.61243e-78 8.72877e-90 u1_3 0 0 v1#branch 4.67569e-90 0 doAnalyses: iteration limit reached tran simulation(s) aborted Error(parse.c--checkvalid): volprobe2: no such vector. ngspice-26 done **************************************************** i tried to change 1n4002 from easy eda itself, from user contribution, and from ONsemi spice2 and spice3 model but non works. can anyone tell me what should i do. thanks before for all of you