Distance from rivers-Zonal Statistics [on hold]

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I am using arcgis 10.1

I am trying to calculate euclidean distance from each feature using this large rivers shapefile http://www.arcgis.com/home/item.html?id=44e8358cf83a4b43bc863646cd695945 .

And once I have a raster with the shorter distance I want to calucate zonal statistics using as zone feature the world borders http://thematicmapping.org/downloads/world_borders.php

Overall what I want is the average distance from water sources at the country level.

However the zonal statistic table gives an error message.

Any suggestions?

Thanks!



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