improve error message
improve error message

crowbar/crowbar,aplanas/crowbar,toabctl/crowbar,MaximilianMeister/crowbar,aspiers/crowbar,mmnelemane/crowbar,tserong/crowbar,toabctl/crowbar,dirkmueller/crowbar,rhafer/crowbar,aspiers/crowbar,nkrinner/crowbar,MaximilianMeister/crowbar,mmnelemane/crowbar,dirkmueller/crowbar,rhafer/crowbar,rsalevsky/crowbar,nkrinner/crowbar,rsalevsky/crowbar,rhafer/crowbar,aplanas/crowbar,SUSE-Cloud/crowbar,vwallfahrer/crowbar,vwallfahrer/crowbar,tserong/crowbar,crowbar/crowbar,SUSE-Cloud/crowbar