I've had my e-sword ap for over 10 years on my desk top. I've got the 2017 version.
It's also on my old ipad but without all the purchased commentaries, dictionaries, and bible versions.
About a month ago, the ap just wouldn't open. It kept telling me there was an unexpected error. I tried opening it from the file page, but got the same response.
It sounds like you might to to uninstall and then reinstall of e-Sword as something has become corrupt