I get an error when trying to import certain json files

[JoyfulGen]

When I click on Import json and then select the json file I want to import, I sometimes get this error:

I noticed this happening once before, but that time the file uploaded just fine when I tried again. Today it's systematic: some files always give the error, and some files are fine! Here are some json files that give the error:

MOTHRA_CH-Fco Ms. 2_006r_annotations.json
MOTHRA_CH-Fco Ms.2 108v_annotations.json
MOTHRA_D-KNd 1161 032r_annotations.json

And here are some files that work fine:

MOTHRA_F-Pn Latin 15181 169v annotations.json
MOTHRA_NZ-Wt MSR-03 013r_annotations.json

@yinanazhou

[yinanazhou]

It's a style issue with the JSON keys. Instead of using imageName, these files are using image_path, etc. What's the source of the files that don't work?