Report will export manually but will not in auto mode

khall

We are able to run each and every report manually either when viewing or exporting, however we receive the following message Crying or Very sad

12/9/2008 12:54:44 PM
Messasge: Conversion from string "" to type 'Double' is not valid.
Source: Microsoft.VisualBasic
Stack Trace: at Microsoft.VisualBasic.CompilerServices.Conversions.ToDouble(String Value, NumberFormatInfo NumberFormat)
at Microsoft.VisualBasic.CompilerServices.Conversions.ToDouble(String Value)
at CrystalDelivery.frmMain.CheckExports(DateTime datCurrentDate)
Target Site: Double ToDouble(System.String, System.Globalization.NumberFormatInfo)

when it runs in auto mode. Could someone please assist?