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License "Expired" error when dynamically creating Excel documents in ASP.NET

Is anyone familiar with the error below? When I run my webapp to create a dynamic excel document from my local machine, it works fine, but when the same piece of code is called on the server, I get the following error. It looks like these are permission problems, since it works on my machine, but not on the server, but I don't know where to start to pinpoint the problem. Any advice / help is appreciated!

Server Error in '/' Application.
--------------------------------------------------------------------------------

This command is unavailable because the license to use this application has expired. 
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.Runtime.InteropServices.COMException: This command is unavailable because the license to use this application has expired.

Source Error: 

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.  

Stack Trace: 


[COMException (0x800a03ec): This command is unavailable because the license to use this application has expired.]
   Microsoft.Office.Interop.Excel.Workbooks.Add(Object Template) +0
   PaymentsReport.Page_Load(Object sender, EventArgs e) +70
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +15
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +34
   System.Web.UI.Control.OnLoad(EventArgs e) +99
   System.Web.UI.Control.LoadRecursive() +47
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1061

Office / Excel is installed on the server, and I can open / save excel documents on the server. Could this be the excel version on the server and my local machine? If so, how can I make sure that I have the latter on the server?

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Office Interop , Office .

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WAG , Office . MS .

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Do you have a licensed activated copy of Excel on the server? It probably works on your local computer because you have Office / Excel installed locally.

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