I advise using the help documents available on the Downloads page set up by the developer. Secondly, if you have older version, access the page and download the latest one.
Download page: http://www.aerjot.home.pl/en_download.html
This error isn't mentioned anywhere else on the web, but if you want official help from the developer then you should contact him using the following email address:
firstname.lastname@example.org or use the form on the Contact US Page.