Hi I have a basic circuit that I copied from an online tutorial that was using LTSpice. I keep getting the below error when trying to run a simulation. I recognize the op amps should have a positive and negative source but that shouldn't affect the simulation from running in the first place?
Warning: singular matrix: check nodes n_8 and n_8
Warning: singular matrix: check nodes n_8 and n_8
Note: Starting dynamic gmin stepping
Trying gmin = 1.0000E-003 Note: One successful gmin step
Trying gmin = 1.0000E-004 Note: One successful gmin step
Trying gmin = 1.0000E-005 Note: One successful gmin step
Trying gmin = 1.0000E-006 Note: One successful gmin step
Trying gmin = 1.0000E-007 Note: One successful gmin step
Trying gmin = 1.0000E-008 Note: One successful gmin step
Trying gmin = 1.0000E-009 Note: One successful gmin step
Trying gmin = 1.0000E-010 Note: One successful gmin step
Trying gmin = 1.0000E-011 Note: One successful gmin step
Trying gmin = 1.0000E-012 Note: One successful gmin step
Warning: singular matrix: check nodes n_10 and n_10
Warning: Dynamic gmin stepping failed
Circuit: * spicenetlist
Doing analysis at TEMP = 0.000000 and TNOM = 27.000000
doAnalyses: matrix is singular
dc simulation(s) aborted
Error(parse.c--checkvalid): v_v2#branch: no such vector.
Note: No ".plot", ".print", or ".fourier" lines; no simulations run
