OCR Serbian

Hi,

I want to OCR a document written in Serbian (Cyrillic script), Latin and German. It's a 19th century book. After I start the OCR process the pages are optimized, and then an error appears. It says:

Could not open data file srp_latin.traineddata. Try resetting!

I tried resetting, but the error still appears. To be clear, I don't need Serbian-Latin OCR, but normal, Cyrillic Serbian.