There are not currently any low-cost airline routes between Ibiza and Bologna (Guglielmo Marconi) with MyAir.
Instead you could try browsing budget flights between Ibiza and Bologna (Guglielmo Marconi) with all airlines.
Another option would be to try browsing all low-cost airline routes to Bologna (Guglielmo Marconi) or all budget routes from Ibiza.
In the meantime, this error has been logged.