ERROR ON EMAIL OF REPORTS

Hi

I am trying to set up the automatic daily emailing on a clients server for the standard Inventory Master Report in Sage 300.

I have added the distribution settings, manage instructions, select instructions but when I click on Send Now I get the following error:

Error occurred during email publish in distribution instruction [Inventory Master]:
Could not load file or assembly 'Microsoft.Office.Interop.Excel, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c' or one of its dependencies. The system cannot find the file specified.

Does anyone have any ideas on how to get past this ?

Regards

Lavinia