求大神帮忙看看错误.....我是小白....拜托了

基于滞环控制的电压型逆变器的仿真，用的simulink仿真，出现代数环，还有很多的不连续，什么意思？怎么改啊？
Warning: Block diagram 'untitledbest' contains 1 algebraic loop(s). To see more details about the loops use the command line Simulink debugger by typing "sldebug untitledbest" in the matlab command window. To eliminate this message, set the Algebraic loop option in the Diagnostics page of the Simulation Parameters Dialog to "None".
Found algebraic loop containing:
  'untitledbest/Subsystem/Relay1' (discontinuity)
  'untitledbest/Subsystem/Relay2' (discontinuity)
  'untitledbest/Subsystem/Relay3' (discontinuity)
  'untitledbest/Subsystem/Relay4' (discontinuity)
  'untitledbest/Subsystem/Relay5' (discontinuity)
  'untitledbest/Subsystem/Relay6' (discontinuity)
  'untitledbest/Multimeter/source/Switches2/Model1/Conduction Logic/ ' (discontinuity)
  'untitledbest/Multimeter/source/Switches2/Model1/Conduction Logic/Test2' (discontinuity)
  'untitledbest/Multimeter/source/Switches2/Model1/Tail/Integrator' (discontinuity)
  'untitledbest/Multimeter/source/Switches2/Model1/Tail/Look-Up  Table'
  'untitledbest/Multimeter/source/Switches2/Model1/Integrator' (discontinuity)
  'untitledbest/Multimeter/source/Switches2/Model1/Tail/Product' (algebraic variable)
  'untitledbest/Multimeter/source/Switches2/Model1/Tail/Switch' (discontinuity)
  'untitledbest/Multimeter/source/State-Space'
  'untitledbest/Multimeter/Gain2'
  'untitledbest/Subsystem/Sum2' (algebraic variable)
  'untitledbest/Subsystem/Sum1' (algebraic variable)
  'untitledbest/Subsystem/Sum3' (algebraic variable)
Warning: Discontinuities detected within algebraic loop(s), may have trouble solving.
Warning: Detected algebraic loop path(s) through integrator reset or IC ports. Results may not be intuitive (see documentation).  Use integrator state port to avoid algebraic loops.
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