simpledemo dont work in iphone5s,ios7.1.2,the warning is cannot inject custom Javascript

hi,i test simpledemo which dont work in iphone5s,ios7.1.2.my host is os x 10.11 and xcode7.1,when i run simpledemo on iphone5 ,the xcode output shows "warning:cannot inject custom Javascript" and no errors.but the iphone5 cant see the www.openwebrtc.org page.
when i run simpledemo on iphone5 simulator ,it is ok.
what is wrong with me?could anyone light me?it will be appreciated.
thanks

Start by reproducing simpledemo on a physical iPhone 5s running iOS 7.1.2 and compare it with the working simulator run. Inspect the Xcode warning "cannot inject custom Javascript" and verify completion by confirming that the www.openwebrtc.org page loads on the device.

Written by the indexing model from the issue text.