Problems when trying to return information for External Content Types in Sharepoint 2013

This is my first post on the forum, until I tried on this problem but have not found anything.
When trying to return the information from the external content displays the following error:
Error retrieving data from mill. Administrators: query the server log for more information.
I do not know what else to do...

Hi,
According to your post, my understanding is that you got an error when tried to return the information from the external content.
Did the error occur when you created a new external content type or created a external list?
You can check the steps with the following articles about how to create a external content type.
http://lightningtools.com/bcs/creating-an-external-content-type-with-sharepoint-designer-2013/
http://wyldesharepoint.blogspot.in/2012/12/sharepoint-2013-setting-up-external.html
If the error occurred with the external list, you can check the steps with the following article.
http://community.bamboosolutions.com/blogs/sharepoint-2013/archive/2013/01/08/how-to-create-external-data-column-in-sharepoint-2013.aspx
You can also check the event log and ULS log to see if anything unexpected occurred.
For SharePoint 2013, by default, ULS log is at
C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\15\LOGS
Thanks & Regards,
Jason
Jason Guo
TechNet Community Support

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Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact
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My CodePlex -
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