我用adams做柔体分析出现了一下错误，请大侠帮忙分析，急！！！

WARNING: The value 1000 was specified for the BDFPAR/ CRMAXIT argument. Since
the corrector algorithm in the BDF methods should converge very rapidly,
such a high number of iterations should not be necessary and may cause
an excessive consumption of cpu time.
WARNING: The value 1000 was specified for the BDFPAR/ CRMAXIT argument. Since
the corrector algorithm in the BDF methods should converge very rapidly,
such a high number of iterations should not be necessary and may cause
an excessive consumption of cpu time.
WARNING: The symbolic refactorization failed. The matrix is structurally singular
at time = 1.5160E-05.
WARNING: The symbolic refactorization failed. The matrix is structurally singular
at time = 1.5160E-05.

根本不能运行。斑竹帮忙。