意外令牌'newline'附近的语法错误?

我的.vimrc文件中写了以下内容

set number 

set hlsearch

set mouse=a

map F2 :bprev CR

采购.vimrc文件时出现以下错误

-bash: .vimrc: line 4: syntax error near unexpected token `newline'
-bash: .vimrc: line 4: `map <F2> :bprev <CR>'