World is not a valid file

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  • Ok, I tried to upload a new world to my server, I have selected upload folder, and it display the "The selected file/folder is not a valid world" error.

    I checked if it was under the limit size, and it was

    I checked if it was corrupted and it works fine on my minecraft client

    I tried to upload it compressed as a .zip file and it didn't work

    My last try was to download the world already on the server and upload it again, and it gives me the same error

    Here are some screenshots from the error and the files inside the world's folder.

    This will be the second time I upload a new world on my server, first time it worked fine, so... is there a limit on how many worlds you can upload on the same server?

    I know my english sucks, i'm sorry