My basic astable 555 circuit:
[Basic Astable 555][1]
Produces both the "Too many iterations without convergence" and the "Error(parse.c--checkvalid): square: no such vector" error.
Both errors are a mystery to me, especially the no such vector error. Any help appreciated. Here's the full simulation log:
Circuit: untitled
Doing analysis at TEMP = 27.000000 and TNOM = 27.000000
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
Warning: Further gmin increment
Note: One successful gmin step
Note: One successful gmin step
Warning: Further gmin increment
Warning: Further gmin increment
Note: One successful gmin step
Note: One successful gmin step
Warning: Further gmin increment
Warning: Further gmin increment
Warning: Further gmin increment
Note: One successful gmin step
Note: One successful gmin step
Warning: Further gmin increment
Note: One successful gmin step
Warning: Further gmin increment
Note: One successful gmin step
Warning: Further gmin increment
Warning: Further gmin increment
Note: One successful gmin step
Warning: Further gmin increment
Note: One successful gmin step
Warning: Last gmin step failed
Warning: Dynamic gmin stepping failed
Note: Starting source stepping
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Note: One successful source step
Warning: source stepping failed
Transient solution failed -
Last Node Voltages
------------------
Node Last Voltage Previous Iter
---- ------------ -------------
xu1.25 0.657512 0.657513
xu1.2 1.46796 1.46818
xu1.3 1.74324 1.74324
xu1.6 1.17052 1.17052
xu1.8 1.71404 1.71404
xu1.9 1.78002 1.78002
xu1_8 1.78002 1.78003
xu1_2 0.785106 0.78469
xu1.5 0.482687 0.482452
xu1.17 0.161441 0.161441
xu1.4 0.72765 0.72765
c2_2 1.1951 1.1951
xu1.12 1.62706 1.62706
xu1.20 1.18674 1.18674
xu1.10 1.75036 1.75036
xu1.22 0.0552941 0.0557033 *
xu1.11 1.16652 1.16631
xu1.14 1.02783 1.02782
xu1.13 1.08117 1.08116
xu1.18 0.610366 0.610363
xu1_7 0.78519 0.784759
xu1.15 0.466162 0.466174
xu1.31 0.616501 0.616501
xu1.27 1.07988 1.07989
xu1.24 0.0129945 0.0129943
xu1.29 1.10502 1.10501
xu1.28 0.491146 0.49113
xu1.16 0.466165 0.466178
square 0.0999989 0.0999955
xu1.26 0.466157 0.466169
v1#branch -0.000595154 -0.00059516
doAnalyses: Too many iterations without convergence
tran simulation(s) aborted
Error(parse.c--checkvalid): square: no such vector.
ngspice-26 done
[1]: https://easyeda.com/editor#id=OiRPb97tE