analyse error?

[hamed739]

hi,
i write 2d frame with 1 joint element program(1story-1bay).
it has error:
" UmfpackGenlinSOE::set size<> : nnz: 166 invalue: 1660
WARNING:UmfpackGenlinSOE::setsize : vertex 15 not in graph-size set to 0
static analysis::handle <>-linearSOE::setsize <>failedstaticanalysis::analyze<>
domainchanged failed at step 0 of 10
opensees > analyse failed, returned :-1 error flag "
why happen it?
thanks.

[vesna]

It looks like there is a problem with your model.

Do eigen analysis first to verify the stability of your model.