Hi, so i downloaded the mod with everything it say it was necessary but i still have this problem. I downloaded the required mod twice and still shows, what do i need to do?

You have to install Fusion like it says. Please share what mods exactly you installed.

I installed the connected glass, but i cant find 'Fusion' when i installed the mod it only had one required mod and i installed it, so i dont know what else i need to download or where to find it

It requires both Fusion and my core library.

You can find Fusion here: https://www.curseforge.com/minecraft/mc-mods/fusion-connected-textures

Thank you! it works now. (-: