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I see that you are using personal geodatabase for storing your contour file. Are you also storing your output raster in the same geodatabase? If yes, there is a possibility that you might be running out of space (depending upon the cell size of output raster) as a personal geodatabase has a size limit of 2 GB.
I would suggest you to use file geodatabase as also mentioned in the following web help documentation.
Types of geodatabases
Hope this helps.