[Kanegasi]

The issue is with Prat, possibly with the Alias module. Are you using that module? If so, did you set any aliases with a percent sign? Did you put a percent sign anywhere in Prat's settings? It's trying to replace something in a chat event using an unescaped percent sign followed by a number, causing string.gsub to interpret that as a capture index.

None of the other addons are related to the actual error. PersoLootRoll is overwriting the error handler (terribly, since a good error handler doesn't report itself in an error) and all the other addons mentioned just happen to hold the active Ace library instances involved with PersoLootRoll's private table.