Fixing an old addon

[Migoda]

I'm still using an old, abandoned addon because it has a functionality which I haven't found on other active addons so far. Sadly it started throwing errors since the latest ESO patches and I don't know how to fix it myself (yet).

Maybe anyone can give me a hint where to start? Here are the error logs:

Failed to create control 'ThurisazGuildInfoAnnouncementDisplay'. Duplicate name.

stack traceback:
[C]: in function 'CreateControl'
user:/AddOns/ThurisazGuildInfo/lib/thlib/UI.lua:29: in function 'TI:CreateControl'
user:/AddOns/ThurisazGuildInfo/lib/thlib/UI.lua:79: in function 'TI:CreateAnnouncementDisplay'
user:/AddOns/ThurisazGuildInfo/guild/announces.lua:132: in function 'TI.ANNOUNCES.Initialize'
user:/AddOns/ThurisazGuildInfo/ThurisazGuildInfo.lua:26: in function 'TI.OnPlayerReady'

user:/AddOns/ThurisazGuildInfo/lib/thlib/UI.lua:30: attempt to index a nil value
stack traceback:
user:/AddOns/ThurisazGuildInfo/lib/thlib/UI.lua:30: in function 'TI:CreateControl'
user:/AddOns/ThurisazGuildInfo/lib/thlib/UI.lua:79: in function 'TI:CreateAnnouncementDisplay'
user:/AddOns/ThurisazGuildInfo/guild/announces.lua:132: in function 'TI.ANNOUNCES.Initialize'
user:/AddOns/ThurisazGuildInfo/ThurisazGuildInfo.lua:26: in function 'TI.OnPlayerReady'

/EsoUI/Libraries/Utility/ZO_Hook.lua:15: attempt to index a nil value
stack traceback:
/EsoUI/Libraries/Utility/ZO_Hook.lua:15: in function 'ZO_PreHook'
user:/AddOns/ThurisazGuildInfo/guild/announces.lua:160: in function 'TI.HookNotifications'
user:/AddOns/ThurisazGuildInfo/guild/announces.lua:136: in function 'TI.ANNOUNCES.Initialize'
user:/AddOns/ThurisazGuildInfo/ThurisazGuildInfo.lua:26: in function 'TI.OnPlayerReady'

Thanks!