Fix Stream exception message grammar
Fix Stream exception message grammar

jaapverloop/Slim,JoeBengalen/Slim,iinux/Slim,iinux/Slim,juliangut/Slim,akrabat/Slim,Sam-Burns/Slim,mnapoli/Slim,RealSelf/Slim,dopesong/Slim,feryardiant/slim,samsonasik/Slim,opengeek/Slim,foxyantho/Slim,iinux/Slim,designermonkey/Slim,slimphp/Slim,AndrewCarterUK/Slim