This is an issue you will need to contact the theme author with. We are unable to support users of themes as we do not have access to the theme, and also premium theme support is not permitted in these forums per WordPress guidelines. If the theme author determines the issue is Redux (it sounds like a malformed URL or incorrect permission, I don’t know as, again, I do not have access to the theme), then they’ll need to be the ones to file an issue with us via our issue tracker and we’ll work with them to solve the issue.
Good luck.