Axis Object - Auto Interval Error

Hello,
I am trying to plot a graph using the following data expression:
=(sum(Fields!Closed.Value)*7.5)/sum(Fields!FTE.Value)
and I get an error whenever I try to publish the graph:
An error has occured while rendering chart chart1. Details: Axis Object - Auto Interval Error Axis Object - Auto Interval Error
Anyone know what causes this and how it can be fixed?
Thanks
Wow... found the answer. So an error in my data caused this expression to be infinity. The Auto Interval Error can not handle a data point that is infinite so to fix this simply perform a check. In this case:
=iif(sum(Fields!FTE.Value)=0,"100",((sum(Fields!Closed.Value)*7.5)/sum(Fields!FTE.Value)))
I used the value 100 here becasue it is beyond my scall so a value of 100 will be very obvious.