maxwell仿真时间一长就出错

泪kkkk

我把最终时间设为0.1，就能仿真，时间设的超出0.1，就会提示：
jiandanduoji (C:/Users/Administrator.wu/Documents/Ansoft/temp/)
  Maxwell2DDesign1 (Transient, XY)
    [warning] Eddy effect settings may need revisiting due to the recent changes in the design.  The default value will be used for the object if the value is not specified.  (12:40:52 下午  8月 07, 2017)
    [error] Time step at 0.11 sec completed, process solver2d error: Internal Solver Error:  'Could not find stich point on surface: please check if there is very small gap between the band and surrounding objects and remove the gap '. (12:43:04 下午  8月 07, 2017)
    [error] Simulation completed with execution error on server: Local Machine. (12:43:04 下午  8月 07, 2017)

这是为什么啊？！哭