Wt

hi i just build the Hello World app from documentation and it runs i can go in browser 0.0.0.0:9090 and it shows but when i tupe anything in it and press button instead it to great me in browser nothing heppends only in right upper screen it seys in red marking loading, on terminal where i run app i get this

*./hello --docroot . --http-address 0.0.0.0 --http-port 9090*
[2016-Jan-07 15:06:00.581113] 8044 - [info] "config: reading Wt config file: /etc/wt/wt_config.xml (location = './hello')"
[2016-Jan-07 15:06:00.583037] 8044 - [info] "WServer/wthttp: initializing built-in wthttpd"
[2016-Jan-07 15:06:00.583774] 8044 - [info] "wthttp: started server: http://0.0.0.0:9090"
[2016-Jan-07 15:06:10.250412] 8044 - [info] "Wt: session created (#sessions = 1)"
[2016-Jan-07 15:06:10.250740] 8044 [/ YZ79iIcHUpcIfkc0] [info] "WEnvironment: UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/47.0.2526.73 Chrome/47.0.2526.73 Safari/537.36"
127.0.0.1 - - [2016-Jan-07 15:06:10.252261] "GET / HTTP/1.1" 200 2568
[2016-Jan-07 15:06:10.252351] 8044 - [info] "WebRequest: took 2.201ms"
127.0.0.1 - - [2016-Jan-07 15:06:10.361078] "GET /?wtd=YZ79iIcHUpcIfkc0&request=style HTTP/1.1" 200 91
[2016-Jan-07 15:06:10.361240] 8044 - [info] "WebRequest: took 84.313ms"
127.0.0.1 - - [2016-Jan-07 15:06:10.370549] "GET /resources/themes/default/wt.css HTTP/1.1" 404 85
127.0.0.1 - - [2016-Jan-07 15:06:10.378798] "GET /resources/webkit-transitions.css HTTP/1.1" 404 85
127.0.0.1 - - [2016-Jan-07 15:06:10.390117] "GET /?wtd=YZ79iIcHUpcIfkc0&sid=-1275848864&webGL=true&scrW=1920&scrH=1080&tz=60&htmlHistory=true&deployPath=%2F&request=script&rand=1164834143 HTTP/1.1" 200 90669
[2016-Jan-07 15:06:10.390251] 8044 - [info] "WebRequest: took 31.177ms"
127.0.0.1 - - [2016-Jan-07 15:06:10.590547] "POST /?wtd=YZ79iIcHUpcIfkc0 HTTP/1.1" 200 51
[2016-Jan-07 15:06:10.590676] 8044 - [info] "WebRequest: took 1.139ms"
Segmentation fault (core dumped)

Any suggestion how to approach this ? What to do?