SSRS Expression throwing Error while Using Guage

Hi All, 

I am stuck into this expression showing error. Please help me.

(IIf(RunningValue(Fields!KPITitle.Value,CountDistinct,Nothing) MOD 2, "#D0D8E8","#E9EDF4"))

ERROR                                                                                                                                     [rsRuntimeErrorInExpression] The Value expression for the gauge panel ‘GaugePanel’ contains an error: Attempted to divide by zero.

Abhishek Parihar BI Consultant (Please mark the post as answered if it answers your question)