Cant publish workshop addon :/

I try to upload it and it says this in Command Prompt

C:/Program Files (x86)/Steam/SteamApps/common/Garry’s Mod/bin>gmpublish.exe create -addon rainbowmodels.gma -icon rainbowmodels.jpg
Garry’s Workshop Publisher 1.0
[Compiled Jun 8 2014 - 17:16:08]
Setting breakpad minidump AppID = 4000
Steam_SetMinidumpSteamID: Caching Steam ID: (Steam ID) [API loaded no]
Storage Quota: 1.0 GB Total, 1023.9 MB free
Opening rainbowmodels.gma
Compressing… [512.0 MB] => Failed!

Please Help!

It is too big.

[editline]8th November 2014[/editline]

Or you don’t have enough RAM or something.