Please use the addons's comments, and not the general forums for specific addon related questions and bug reports:
https://www.esoui.com/downloads/info...uildStore.html
General things to do in your case
Logout, find the correct addons folder by reading this thread and checking if your addons are in that corerct folder:
https://www.esoui.com/forums/showthread.php?t=8858
-> Try the screenshot trcik to get the folder name
Then check your addons and dependencies are all up2date to the newst versions!
After that backup your SavedVariables folder or at least the AwesomeGuildSTore.lua file in the live/SavedVariables folder, like described here:
https://www.esoui.com/forums/showthread.php?t=9235
Login and ONLY enable AwesomeGuildStore and the needed libraries/dependencies.
Test if this fixes the error for you already. If so, enable your other addons that you ahd enabled as the error happened, and tyrto find out which one is causing the error by disabling the other addons 1 after another again.
Addon profile managers like Circonians Addon Selector might help you.
If you are used to LibDebugLogger and/or DebugLogViewer you might even collect error information and debug messages for the AGS author and provide it to him. See "how to report an error" message (if you get any at login e.g.):
https://www.esoui.com/forums/showthread.php?t=8858