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I get the following error when I try to merge the files:

Merge error

The error says that there is an unexpected error. I have deleted the lock files and an empty ArcMap document. It still gives me this error.

  • Please post your error messages as TEXT not as an image. To get the text, copy any past the top-level "Messsages" item from your screenshot there. – Son of a Beach Sep 2 at 0:07
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    Was the merge run with background processing enabled? Some people have reported this error was fixed by disabling background processing (I know... doesn't make sense). – Son of a Beach Sep 2 at 0:10
  • We always got this error on appends (never do merges) until we disabled background processing. BP creates locks that get in the way of updating files (odd but true). – danak Sep 3 at 17:58

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