Issue reported by Romain: The attached file has a group name missing from the last group. This used to fail the validator, by nor being a recognisable AGS4 file. Currently the error is reported as: [CreatingErroringFile_withAdditionalGroup.ags](/uploads/cfbdb14cbddbc18c2db02a478d43431e/CreatingErroringFile_withAdditionalGroup.ags) Line -                All arrays must be of the same length  This error message is not very useful and needs to be made more human-friendly.