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Failed to open table. Error: An Item with the same key has already been added

Question asked by ryan.daily on May 22, 2018
Latest reply on Nov 17, 2018 by Dan_Patterson

I keep getting this error message when after joining a table with no spatial data to a Shapefile via a common attribute 

 

 

I'm new to ArcGIS but have been able to do this easily using QGIS recently. I have literally no idea what the message means. This has happened with two separate shp files. 

 

Can someone help please?

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