“ERROR -- Convergence problem in transient analysis at Time =  460.0E-06
         Time step =  4.487E-15, minimum allowable step size =  5.000E-15

  These supply currents failed to converge:

    I(V_V1)                   =     3.941A  \    -6.727A

ERROR -- Discontinuing simulation due to convergence problem“
請問這是個什么錯誤，請高手指點