Error with Excel and C# when logged off the server

RowenaReddy asked:

Hi,
I have written a windows service in C#, my service is meant to open an excel macro enabled workbook (this is in Excel 2010) i have installed this service on our server which is running server 2008, it is 64 bit. My service seems to have a problem launching Excel when no one is logged on the server, does anyone have a solution to this.

i get the following error

System.Runtime.InteropServices.COMException (0x8000401A): Retrieving the COM class factory for component with CLSID {00024500-0000-0000-C000-000000000046} failed due to the following error: 8000401a.

Excel is installed on the server, the service works fine when i am logged on the server but once all users have logged off i get the above error. i would like the service to launch my excel work book regardless of an open sesson on the server or not.

Tags: C#, Microsoft Excel

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