It says it can use files from donjon, but whenever I try to import the JSON file it says it can't read the format?

Also having this issue when attempting to joad a JSON from donjon.

There also appears to be an issue with importing json's from watabou's One Page Dungeon generator, it imports the OPD in at the program's default  map size of 42 x42 which causes the grid to be improperly sized and misaligned.