急！！！各位大神求帮忙！

cocoapods不能正常pod install,也不能pod update
只要pod install或者pod update就会出现以下错误：

 /Library/Ruby/Site/2.0.0/rubygems.rb:270:in `find_spec_for_exe': can't find gem cocoapods (>= 0.a) (Gem::GemNotFoundException)
    from /Library/Ruby/Site/2.0.0/rubygems.rb:298:in `activate_bin_path'
    from /usr/local/bin/pod:22:in `<main>'

求大神解救！！！

已解决！
1.gem install cocoapods
2.pod install
如果工程报错：
pod update