Addy That happens when you have a folder inside of a folder the launcher searches for mods in, but said folder doesn't have the required structure.
Example: "<Place of install>\Mods\Cool
That happens when you have a folder inside of a folder the launcher searches for mods in, but said folder doesn't have the required structure.
Example: "<Place of install>\Mods\Cool Mod 1" is the correct place to put files such as Meta.ini and other mod folders such as CustomFiles. "<Place of install>\Mods\Cool Mod 1\Cool Mod 1" is not.