Error loading BigWigs_BlackwingLair\Locales\Locales\frFR
.......

\Locales\Locales\ error

Open BigWigs_BlackwingLair\Locales\locales.xml
change to

<Script file="koKR.lua"/> <Script file="frFR.lua"/> <Script file="zhTW.lua"/> <Script file="zhCN.lua"/> <Script file="deDE.lua"/> <Script file="esES.lua"/> <Script file="ruRU.lua"/> <Script file="itIT.lua"/> <Script file="ptBR.lua"/> then you can fix this.