For ocrmypdf or just general tesseract work, you may need to install language packages, depending on the languages you are working in.
ERROR – The installed version of tesseract does not have language data for the following requested languages:
run the command
tesseract --list-langs
Error opening data file /usr/local/share/tessdata/eng.traineddata
Please make sure the TESSDATA_PREFIX environment variable is set to your “tessdata” directory.
Failed loading language ‘eng’
Tesseract couldn’t load any languages!
List of available languages (0):
Download the proper language data into the folder folder listed in the “Error opening data file”