I get the following error while launching the simulation for my test project https://easyeda.com/editor#id=4a734bb99f6c4755bffacd8c43dc221b: What do I hav to change to make it work? Thanks in advance! Circuit: gooduntitled Doing analysis at TEMP = 27.000000 and TNOM = 27.000000 Warning: singular matrix: check nodes c1_2 and c1_2 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 c1_2 and c1_2 Warning: Dynamic gmin stepping failed Note: Starting source stepping Warning: singular matrix: check nodes c1_2 and c1_2 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 c1_2 and c1_2 Warning: singular matrix: check nodes c1_2 and c1_2 Warning: source stepping failed Transient solution failed - Last Node Voltages ------------------ Node Last Voltage Previous Iter ---- ------------ ------------- +3v 0 0 c1_1 0 0 u1.5_11 0 0 c1_2 0 0 v1#branch 0 0 doAnalyses: iteration limit reached tran simulation(s) aborted Error(parse.c--checkvalid): out: no such vector. ngspice-26 done