I extracted the GSE and GSE-Core folders (v2.1) to my ".../World of Warcraft/Addons/Interface" folder, and receive the following error when the game loads:

GSE\GUI\Transmission.lua:12:` Cannot find a library instance of "AceGUI-3.0-34-Completing-EditBox".
[C]: in function `error'
AskMrRobot\Libs\LibStub\LibStub.lua:23: in function `LibStub'
GSE\GUI\Transmission.lua:12: in main chunk

Locals:
(*temporary) = "Cannot find a library instance of "AceGUI-3.0-Completing-EditBox"."

Any suggestions?

extracted from where?

GSE 2.1.0 shouldnt include the GS-Core folder anymore

EDIT: Checked Curse. THe GS-Core folder is not included in the build as intended. Also the Completing EditBox is included in the Lib folder.

I'm guessing that you extracted the code from here and dont have the libraries that are included with GSE when Curse does a build.

You will need to download every package listed in:

https://github.com/TimothyLuke/GnomeSequencer-Enhanced/blob/master/.pkgmeta#L3

And place them in the Lib folder of the GSE install.

Or if you use the Curse package this is done for you. Curse also does all the translation stuff.

Yeah Git Doesnt include any of the libraries. Curse pulls them when it creates the release.