PublishWorkshopFile failed! (24)

[NyxxBro]

Here is my code when I try to publish my map:

C:\Users\gspan\Desktop>gmpublish.exe create -addon C:\Users\gspan\Desktop\addon\rp_cscdesert_mythical_v2.gma -icon C:\Users\gspan\Desktop\addon\icon.jpg
Garry's Workshop Publisher 1.1
[Compiled Jun 27 2016 - 19:52:00]
Setting breakpad minidump AppID = 4000
Steam_SetMinidumpSteamID: Caching Steam ID: 76561198160404094 [API loaded no]
Storage Quota: 1.0 GB total, 915.5 MB free
Opening C:\Users\gspan\Desktop\addon\rp_cscdesert_mythical_v2.gma
Compressing.. [163.1 MB] => [54.2 MB]
Deleting addon_uploads/1481154251_3601191624.gma (54.2 MB)...
Sending Addon to Steam..
Sending Icon to Steam..
Publishing "rp_cscdesert_mythical_v2"..
(this can take a long time - it's actually uploading the files right now..)
100%
0%
100%
PublishWorkshopFile failed! (24)

It is a custom map for my server, but it keeps giving me this error. Any help would be appreciated!