Argument With An Error at simulink

Hello Every One... Recently I faced an error which i couldn't get rid of... it is about consecutive zero crossing... the error occurs even when i disabled the un-ticked the 'Enable zero crossing detection' of PID Controller but it didn't work. The error dialog is: "to continue the simulation, you may 1) Try using Adaptive zero-crossing detection algorithm or 2) Disable the zero crossing of the blocks shown in the following table. "

Would You Please Help...