Can't encode transcription error with Arabic diacritics Fine Tuning process

[Fahad Al-Saidi]

Hi,

I am trying to fine tuning process for arabic diacritics. I just add one char shaddad ّ  to arbitrary word. I got first this error:

Normalization failed for string 'َّس'

then
Can't encode transcription: 'روص :ليجستلا هذه ،ةطساوب مالَّسلا ميوقتلا ال« ىلوألا' in language ''

In the wiki page, I read
Encoding of string failed! results when the text string for a training image cannot be encoded using the given unicharset.

but How I can fix it?

Thanks in advance,

Fahad