I have all required mods, Forge, Geckolic, Terrablender, and the mods file itself, however when I open it all in minecraft, it just gives me an error and says that it cannot launch.

Hi, this issue was marked as closed so I didn't think this was an active issue. If you are still encountering this could you please open a new issue and let me know what version of the mod you are trying to run and attach a crash report. That way I should be able to help you out!

Still having the issue as well