make error around json editor more obvious
make error around json editor more obvious

Colum-SMA-Dev/MediaPlaybackFramework,Colum-SMA-Dev/MediaPlaybackFramework,Colum-SMA-Dev/MediaPlaybackFramework,UoSMediaFrameworks/uos-media-playback-framework-legacy,UoSMediaFrameworks/uos-media-playback-framework-legacy,UoSMediaFrameworks/uos-media-playback-framework-legacy