Problem to upload/update mod

I try to update my mod or upload a new version, so I click on “Steam upload” on ADK, after I click on “Cook Gamemode” and after I click on “Upload” so a windows opens and it’s say me that:
Uploading content…ERROR! Failed to update workshop item (File Not Found).
Thanks you if someone can help me and sorry if my english is bad but I’m french ^^’

I’m also experiencing this, but with another game. I wanna know what is this problem!