Modpack not launching for some players

[Galvas]

My modpack is functional for me but some people reported problems. Does anyone know what this log means?

[Kalbintion]

It is complaining about an invalid JSON value. Which file it was attempting to read, unsure. Whatever it attempted to read it failed immediately. Most likely indicating a corrupted file of some sort.

[Galvas]

Thanks for the help, I'll tell them to delete and redownload.