go vim 补全和颜色

Question

MAC 环境下

vim-go（https://github.com/fatih/vim-go） 补全 <C-x> + <C-o>
出现这个错误： Omni completion (^O^N^P) Pattern not found 并且补全窗口一直没有也无法使用
颜色根本没有
.vimrc 配置

set nocompatible
filetype off
set number
syntax on

set rtp+=~/.vim/bundle/Vundle.vim
call vundle#begin()

Plugin 'VundleVim/Vundle.vim'
Plugin 'fatih/vim-go'

call vundle#end()
filetype plugin indent on

go env

GOARCH="amd64"
GOBIN="/Users/zhengya/go/bin"
GOCACHE="/Users/zhengya/Library/Caches/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/zhengya/go"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/go"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/bt/gh05fvc17sqfhmty4bymb_s40000gn/T/go-build616434324=/tmp/go-build -gno-record-gcc-switches -fno-common"

百度很久都没有解决，求大神支招