TekTopia Mod Issues

So basically, me and my friend wanted to create a server for the Tektopia mod. I downloaded the mod and forge and opened the forge version, but when I tried to enter the Aternos server, there showed a long list of errors which consisted of "[MOD Name]: Requires version [String of numbers] but mod is not found on client". On singleplayer, the mod runs perfectly fine, but it just won't work for the Aternos server. Is there any way to solve this issue? Thanks

How can I do that?

Yep, I got Tektopia in my mods folder, started my Minecraft with the right forge, and added TekTopia to my Aternos server.