The {2} expression for the {0} {1}' has an aggregate function parameter that is not valid for the function RunningValue. ...

The {2} expression for the {0} ‘{1}' has an aggregate function parameter that is not valid for the function RunningValue.  The aggregate function parameter must be one of the following: First, Last, Sum, Avg, Max, Min, Count, CountDistinct, StDev, Var, StDevP, VarP.