PDF problem

Hi, in first time thank you for your plugin. Its simple and great!

Ikros plugin have any problem with error mesagges, for example i get API error, but real response was:
{“ResultCode”:400,”Message”:”DocumentNumber is required”}

There is any problem with generate document number, where i put 50YYXXXX i got string error > 5 chars, but in php code have combination like RRRRXXXX [8 chars].

This i fix directly in code, but now i get other error:

Faktúra objednávky s ?. 8564 nebola vygenerovaná s problémom : iKros problém : Nebolo mo?né získa? pdf faktúry.

There is need get PDF file in web admin side?

Web admin side have PDF, and ikros side have pdf TOO, what is this error? We can fix it too? Thank you very much!