White screen first after login

everytime I login, there’s always this white page showing only one line of this:

<mysite>/plugins/w3-total-cache/pub/img/w3tc-sprite-retina.png) !important; background-size: 30px 64px !important; } }

Please help. Thanks

http://ww.wp.xz.cn/extend/plugins/w3-total-cache/