ui error failed to create control AC_CATEGORY_SETTINGS duplicate name
 

does anyone know which add on this belongs to i can't talk to any store npc it won't bring up the list anymore

Check your addons for something with the characters AC, e.g. Auto Category.
Install the newest version of the addon or check if there is an updated version like "Updated", "Revised", "Fixed".

Or use a tool like Notepad++ and it's "search -> Search in files" feature to search your live/AddOns folder for the string or parts of it like AC_CATEGORY