I did some tests, and I didn't found any error on this source. Can you reply me with the manga URL you are getting this error? Make sure to download the last version please
Not sure where I should check the version but I downloaded it yesterday so it should be up to date.
I didn't find where you store the error msgs, and I couldn't select the text in the error msg window so here's a screenshot, if you need more info let me know cuz this app seems pretty useful.
Not sure where I should check the version but I downloaded it yesterday so it should be up to date.