pod install error

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Traceback (most recent call last):
    12: from /usr/local/bin/pod:23:in `<main>'
    11: from /usr/local/bin/pod:23:in `load'
    10: from /usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.5.0/bin/pod:55:in `<top (required)>'
     9: from /usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.5.0/lib/cocoapods/command.rb:52:in `run'
     8: from /usr/local/lib/ruby/gems/2.5.0/gems/claide-1.0.2/lib/claide/command.rb:324:in `run'
     7: from /usr/local/lib/ruby/gems/2.5.0/gems/claide-1.0.2/lib/claide/command.rb:337:in `rescue in run'
     6: from /usr/local/lib/ruby/gems/2.5.0/gems/claide-1.0.2/lib/claide/command.rb:396:in `handle_exception'
     5: from /usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.5.0/lib/cocoapods/command.rb:67:in `report_error'
     4: from /usr/local/lib/ruby/gems/2.5.0/gems/cocoapods-1.5.0/lib/cocoapods/user_interface/error_report.rb:119:in `search_for_exceptions'
     3: from /usr/local/lib/ruby/gems/2.5.0/gems/gh_inspector-1.1.3/lib/gh_inspector/inspector.rb:62:in `search_exception'
     2: from /usr/local/lib/ruby/gems/2.5.0/gems/gh_inspector-1.1.3/lib/gh_inspector/inspector.rb:68:in `search_query'
     1: from /usr/local/lib/ruby/gems/2.5.0/gems/gh_inspector-1.1.3/lib/gh_inspector/sidekick.rb:34:in `search'
/usr/local/lib/ruby/gems/2.5.0/gems/gh_inspector-1.1.3/lib/gh_inspector/sidekick.rb:95:in `parse_results': undefined method `map' for nil:NilClass (NoMethodError)


这个先声明, 我的cocoapod一直正常, 只是这个项目突然就这样的,其他项目都ok,
所以需要更新一下xcodeproj文件,没错, 在项目文件夹下, 输入
gem update xcodeproj
即可