examples fail

[goldalworming]

2014/07/24 15:31:39 http: panic serving 127.0.0.1:57957: runtime error: invalid memory address or nil pointer dereference
goroutine 4 [running]:
net/http.func·007()
/usr/lib/go/src/pkg/net/http/server.go:1022 +0xac
main.func·001(0xc2000cf040, 0xc2000b05b0, 0xc2000ba5b0)
/home/arief/web/go/ant0ine/go-urlrouter-master/examples/webserver/main.go:37 +0x55
net/http.HandlerFunc.ServeHTTP(0xc2000765a0, 0xc2000cf040, 0xc2000b05b0, 0xc2000ba5b0)
/usr/lib/go/src/pkg/net/http/server.go:1149 +0x3e
net/http.(_ServeMux).ServeHTTP(0xc2000994e0, 0xc2000cf040, 0xc2000b05b0, 0xc2000ba5b0)
/usr/lib/go/src/pkg/net/http/server.go:1416 +0x11d
net/http.serverHandler.ServeHTTP(0xc2000969b0, 0xc2000cf040, 0xc2000b05b0, 0xc2000ba5b0)
/usr/lib/go/src/pkg/net/http/server.go:1517 +0x16c
net/http.(_conn).serve(0xc2000ae1b0)
/usr/lib/go/src/pkg/net/http/server.go:1096 +0x765
created by net/http.(_Server).Serve
/usr/lib/go/src/pkg/net/http/server.go:1564 +0x266
2014/07/24 15:31:39 http: panic serving 127.0.0.1:57958: runtime error: invalid memory address or nil pointer dereference
goroutine 5 [running]:
net/http.func·007()
/usr/lib/go/src/pkg/net/http/server.go:1022 +0xac
main.func·001(0xc2000cf040, 0xc2000b07e0, 0xc2000ba680)
/home/arief/web/go/ant0ine/go-urlrouter-master/examples/webserver/main.go:37 +0x55
net/http.HandlerFunc.ServeHTTP(0xc2000765a0, 0xc2000cf040, 0xc2000b07e0, 0xc2000ba680)
/usr/lib/go/src/pkg/net/http/server.go:1149 +0x3e
net/http.(_ServeMux).ServeHTTP(0xc2000994e0, 0xc2000cf040, 0xc2000b07e0, 0xc2000ba680)
/usr/lib/go/src/pkg/net/http/server.go:1416 +0x11d
net/http.serverHandler.ServeHTTP(0xc2000969b0, 0xc2000cf040, 0xc2000b07e0, 0xc2000ba680)
/usr/lib/go/src/pkg/net/http/server.go:1517 +0x16c
net/http.(_conn).serve(0xc2000ae2d0)
/usr/lib/go/src/pkg/net/http/server.go:1096 +0x765
created by net/http.(_Server).Serve
/usr/lib/go/src/pkg/net/http/server.go:1564 +0x266
2014/07/24 15:31:39 http: panic serving 127.0.0.1:57959: runtime error: invalid memory address or nil pointer dereference
goroutine 6 [running]:
net/http.func·007()
/usr/lib/go/src/pkg/net/http/server.go:1022 +0xac
main.func·001(0xc2000cf040, 0xc2000b0a80, 0xc2000ba8f0)
/home/arief/web/go/ant0ine/go-urlrouter-master/examples/webserver/main.go:37 +0x55
net/http.HandlerFunc.ServeHTTP(0xc2000765a0, 0xc2000cf040, 0xc2000b0a80, 0xc2000ba8f0)
/usr/lib/go/src/pkg/net/http/server.go:1149 +0x3e
net/http.(_ServeMux).ServeHTTP(0xc2000994e0, 0xc2000cf040, 0xc2000b0a80, 0xc2000ba8f0)
/usr/lib/go/src/pkg/net/http/server.go:1416 +0x11d
net/http.serverHandler.ServeHTTP(0xc2000969b0, 0xc2000cf040, 0xc2000b0a80, 0xc2000ba8f0)
/usr/lib/go/src/pkg/net/http/server.go:1517 +0x16c
net/http.(_conn).serve(0xc2000ae3f0)
/usr/lib/go/src/pkg/net/http/server.go:1096 +0x765
created by net/http.(*Server).Serve
/usr/lib/go/src/pkg/net/http/server.go:1564 +0x266
^Cexit status 2