solve (void) error 1 returned in factorization

[alimohammadian]

Hello

I model soil with structure in 2d domain. When I analyze model under earthquake after 8 sec (step 1600) opensees show the following sentences



solve (void) error 1 returned in factorization dgstrf
solvecurrentstup the linearsysofeqn failed in solve
analyza failed returned -3 error flag



I upload my code here

http://www.uploadmb.com/dw.php?id=1454786174


can anybody help me?