Fix to error shown when validation rule is invalid.
Fix to error shown when validation rule is invalid.

kenjis/csv-maker-for-bookcyber,atarun/web,uzura8/torilife,atarun/web,aidenfoxx/fuel-commerce,atarun/web,fjcarreterox/agdata-management,kenjis/fuelphp-1.x-composer,ericouyang/simple_community,atarun/web,plusonedev/booth-api,Darragh-McCarthy/basic-ajax-login,uzura8/flockbird,atarun/web,vano00/blog,uzura8/flockbird,wata727/fuel-simplesamlphp-example,uzura8/fuel_sample,tmatthewsdev/Sample,tmatthewsdev/blog_dev,laothud/Loelo_House,earthmaniebo/my-card-game,vano00/jobs,Darragh-McCarthy/angular-ajax-login,lincolnbrito/curso-fuelphp,Darragh-McCarthy/angular-ajax-login,yamadatarousan/game,uzura8/torilife,mil-tokyo/jphacks-web,KarasawaTakahiro/DigakuseiTrip,atarun/web,mitiruna/magicgirl,yusuke84/htmlparser,masahide/tfa-passwd,laothud/Loelo_House,notfoundsam/yahooauc,notfoundsam/yahooauc,notfoundsam/yahooauc,fenom/fuel,AkioKanno/fuel,lincolnbrito/fuel-intro,arushishi/gmenu,kiro112/deck_cards,mil-tokyo/jphacks-web,mitiruna/magicgirl,hayatan/toire-api,fuel/fuel,cecep-edu/siac,minlite/0x4d,Y-NAKA/htmlparser,GitZiko/customize_fuelphp,fjcarreterox/agdata-management,thomi137/journal,notfoundsam/yahooauc,hugolacerda/RavenWriters,y-ohgi/fuel_unity,uzura8/tasks,kunaldpatel/purple-elephant,kawasakiatsushi/fuelphp,kenjis/fuelphp1st-2nd-contact-form,uzura8/flockbird,keitarou/fuelphp_sample_blog,KarasawaTakahiro/BizTechChallenge,minlite/0x4d,atarun/web,Darragh-McCarthy/basic-ajax-login,vano00/jobs,BenWoodford/StaffsLAN,qipa/fuel,yusuke84/htmlparser,Y-NAKA/htmlparser,uzura8/torilife,tmatthewsdev/newsfeed,atarun/web,taishikato/Practice-Fuel-PHP,Omi-Yasu/sp_bulletin_board,Slade-Andrew/noticeboard_test,ericouyang/simple_community,aidenfoxx/fuel-commerce,arushishi/gmenu,actcat/sideci_php_sandbox2,thuraucsy/fuel,laothud/Loelo_House,ice-inc/sakana,atarun/web,yamadatarousan/game,uzura8/tasks,harady/fuel,uzura8/tasks,uzura8/flockbird,niinoeiichi/de,earthmaniebo/my-card-game,atarun/web,himaratsu/appbot,Fayapan/orchestra,masahide/tfa-passwd,yuichiroTCY/fuel-controller-test,fenom/fuel,hughybarra/final_project,niinoeiichi/de,uzura8/torilife,arushishi/fuel_test,KarasawaTakahiro/BizTechChallenge,hugolacerda/RavenWriters,vano00/blog,kawasakiatsushi/fuelphp,hughybarra/final_project,Omi-Yasu/fuelphp_test,uzura8/tasks,BenWoodford/StaffsLAN,harupiyo/fuelphp_oauth_login_sample,hmukaida/fuelphp-test