Well , this error is quite common in e17 , there is any application that does not work well with E17, look at who are working to learn exactly what causes this error application.
Pressing F1 is usually sufficient, only restart Enlightenment, do not lose any work they are doing.
Anyway, I work very hard with E17 and I have not had a single reboot with this version.
Do not worry it's nothing major is only one possible application is incompatible with e17.
Formerly we were making a theme, borders had one that turned red when something was wrong at Enlightenment.