public string ExpressionErrorMessage {get; set;}
'Declaration Public Property ExpressionErrorMessage As String
If this property is not set and an expression can't be parsed, or if you get a divide-by-zero type exception, ActiveReports will throw a ReportScriptException and stop the report from running.
When this property is set to a valid string, the engine stops throwing exceptions and instead displays the specified string (like Excel). Set it to ### and try Sales/0 to test.
Persistence: There is a new attribute called "ExprError" in .rpx files.