Lua грешка in Модул:languages/errorGetBy at line 21: The language, etymology language or family name "Прасловенски" is not valid..

Backtrace:

[C]: in function "error"
Модул:languages/errorGetBy:21: in function "canonicalName"
Модул:languages:1764: in function "getByCanonicalName"
Модул:category_tree/poscatboiler/data/terms_by_etymolo:977: in function "get_source_and_source_desc"
Модул:category_tree/poscatboiler/data/terms_by_etymolo:993: in function "handler"
Модул:category_tree/poscatboiler:221: in function "initCommon"
Модул:category_tree/poscatboiler:34: in function "new_main"
Модул:category_tree:46: in function "chunk"
mw.lua:527: ?
[C]: ?
[C]: in function "expandTemplate"
mw.lua:333: in function "expandTemplate"
Модул:auto_cat:228: in function "chunk"
mw.lua:527: ?
[C]: ?