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Error publishing Geoprocessing model to ArcGIS Server

Question asked by freak_of_nature on Jan 16, 2013
I am trying to make a geoprocessing service that is going to be used in a silverlight application. I made the model and is working nicely but when I try to add it to a service it shows an error saying that the parameters are invalid.
The model is using the MakeRouteEventLayer tool, which needs the SHPs ID field, an ID field in the input table that matches the SHPs ID field and a beginning and ending field.
Is there any way I can tell the model that this are variables?

I attached a snapshot of the model and the error it gives when trying to create the service.

PS. I developed the model using ArcGIS Desktop 9.2 but the ArcGIS Server I am using is version 9.3.1