LS-DYNA？

*** Error 20460 (STR+460)

     load curve ID 1845575481 is not defined.

     Reference: specified velocity boundary - node

 *** Error 20620 (STR+620)

     Illegal applicable dof on Vel. Card= 0

     Code = 1.

LS-DYNA报错，这两个错误是什么意思，求解