Dear Sir/Madam

I am getting these errors while simulating Astable Multivibrator using 555 timer.

please help me in rectifying these error.

Circuit: * c:\fossee\astable555\astable555.cir

Warning : IC on non-existant node - net
Error on line 5 : .ic v(net-_c1-pad1_)=0.01
Error: .ic syntax error.
Error on line 0 : q.x1.q1 net-_r1-pad1_ x1.2 0 x1.qnom
Unable to find definition of model
Reducing trtol to 1 for xspice 'A' devices
Doing analysis at TEMP = 27.000000 and TNOM = 27.000000

Warning: Too many analog/event-driven solution alternations

Transient solution failed -

Last Node Voltages
------------------

Node Last Voltage Previous Iter
---- ------------ -------------
net-_r1-pad1_ 4.98077 4.98077
net-_r1-pad2_ 5 5
net-_c1-pad1_ 4.97189 4.97189
x1.18 -32983.7 -32983.7
x1.23 1.67352 1.67352
x1.9 0.2 0.2
x1.2 0.2 0.2
x1.qnom 4.98077 4.98077
x1.20 -32983.7 -32983.7
x1.17 16330.9 16330.9
x1.19 16330.9 16330.9
net-_c2-pad1_ 3.3388 3.3388
x1.11 5 5
x1.12 0 0
out 5 5
net 0 0
e.x1.e1#branch 0 0
e.x1.e2#branch 0 0
v1#branch -0.000334705 -0.000334705
a.x1.a4#branch_1_0 0 0
a.x1.a3#branch_1_0 0 0
a.x1.a6#branch_1_0 4.57859e-012 4.57859e-012
a.x1.a5#branch_1_0 0 0

doAnalyses: iteration limit reached

run simulation(s) aborted
Error(parse.c--checkvalid): net: no such vector.
Error(parse.c--checkvalid): a.x1.a3#branch_1_0: no such vector.
Error: no such vector v(out)
ngspice 1 ->
Interrupted once . . .
Warning: clearing control structures
ngspice 1 ->