[Bugfix:Developer] Update config.json error message (#8145)
[Bugfix:Developer] Update config.json error message (#8145)

7.2 to 7.4
Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty