Sorry about the late James. Your tip have solved my problem. Thank you very much!
Thank you very much. Well, i will have to use Post Titles to make my field group items editable.
I tried again and the json file was successfully imported.
Thank you!
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Yeah, sure! This is the file: https://www.dropbox.com/s/jx9inly86rk54g1/acf-export-2014-12-13.json?dl=0
I updated the ACF PRO plugin to version 5.1.5, but the problem keeps happening.