IOS UIWebView Crash

Hi 2all!
I’m newbie in ue4 and my eanglish skills are very bad, thats why sorry)
I’m trying to use webview in my ios game to display some html, but when i trying to use webview there is a crash, in log it looks like:
webkitinitialize and nothing alse more(
need your help, i dont know what to do(

no thoughts about this?(