pod install 報(bào)錯(cuò)：NoMethodError - undefined method `size' for nil:NilClass
――― TEMPLATE END ――――――――――――――――
[!] Oh no, an error occurred.
解決方法：
rm -rf Podfile.lock
rm -rf Pods/
pod install
pod install
Analyzing dependencies
Downloading dependencies
xcode-select: error: tool 'xcodebuild' requires Xcode, but active developer directory '/Library/Developer/CommandLineTools' is a command line tools instance
――― MARKDOWN TEMPLATE ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――――
### Command
```
/Users/user/.rvm/rubies/ruby-2.6.6/bin/pod install
```
### Report
* What did you do?
* What did you expect to happen?
* What happened instead?
### Stack
```
?? CocoaPods : 1.9.3
? ? ? ? Ruby : ruby 2.6.6p146 (2020-03-31 revision 67876) [x86_64-darwin19]
? ? RubyGems : 3.0.8
? ? ? ? Host : Mac OS X 10.15.5 (19F101)
?? ? ? Xcode :? ()
?? ? ? ? Git : git version 2.24.3 (Apple Git-128)
Ruby lib dir : /Users/user/.rvm/rubies/ruby-2.6.6/lib
Repositories : aliyun - git - https://github.com/aliyun/aliyun-specs.git @ dbad14ebc678e5bd343fb0a14028261e94f14787
?? ? ? ? ? ? ? cocoapods - git - https://github.com/CocoaPods/Specs.git @ 77c0789567a57c1e5ff50eaef628ba9e65286566
?? ? ? ? ? ? ? taobao-baichuansdk-alibcspecs - git - http://repo.baichuan-ios.taobao.com/baichuanSDK/AliBCSpecs.git @ ca0454d5afe49986afe11d8d2869c268e1439bd3
?? ? ? ? ? ? ? trunk - CDN - https://cdn.cocoapods.org/
```
### Plugins
```
cocoapods-deintegrate : 1.0.4
cocoapods-plugins? ? : 1.0.0
cocoapods-search? ? ? : 1.0.0
cocoapods-stats? ? ? : 1.1.0
cocoapods-trunk? ? ? : 1.5.0
cocoapods-try? ? ? ? : 1.2.0
```
### Podfile
```ruby
# Uncomment the next line to define a global platform for your project
source 'https://github.com/CocoaPods/Specs.git'
Xxxx
#post_install do |installer|
#? ? copy_pods_resources_path = "Pods/Target Support Files/Pods-CouponApp/Pods-CouponApp-resources.sh"
#? ? text = File.read(copy_pods_resources_path)
#? ? string_onceCopy = File.read("copy_pod_resources_once.patch")
#? ? string_time = Time.now.strftime("%Y%m%d%H%M%S")
#? ? string_onceCopy = string_onceCopy.gsub("#Time#", string_time)
#? ? text = text.gsub("set -e", string_onceCopy)
#? ? File.open(copy_pods_resources_path, "w") {|file| file.puts text}
#end
# Prevent Cocoapods from embedding a second Flutter framework and causing an error with the new Xcode build system.
install! 'cocoapods', :disable_input_output_paths => true
```
### Error
```
NoMethodError - undefined method `size' for nil:NilClass
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/ruby-macho-1.4.0/lib/macho/macho_file.rb:455:in `populate_mach_header'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/ruby-macho-1.4.0/lib/macho/macho_file.rb:233:in `populate_fields'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/ruby-macho-1.4.0/lib/macho/macho_file.rb:55:in `initialize_from_bin'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/ruby-macho-1.4.0/lib/macho/macho_file.rb:33:in `new_from_bin'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/ruby-macho-1.4.0/lib/macho/fat_file.rb:365:in `block in populate_machos'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/ruby-macho-1.4.0/lib/macho/fat_file.rb:364:in `each'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/ruby-macho-1.4.0/lib/macho/fat_file.rb:364:in `populate_machos'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/ruby-macho-1.4.0/lib/macho/fat_file.rb:156:in `populate_fields'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/ruby-macho-1.4.0/lib/macho/fat_file.rb:95:in `initialize'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/ruby-macho-1.4.0/lib/macho.rb:31:in `new'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/ruby-macho-1.4.0/lib/macho.rb:31:in `open'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/xcode/linkage_analyzer.rb:16:in `dynamic_binary?'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/sandbox/file_accessor.rb:171:in `block in vendored_dynamic_frameworks'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/sandbox/file_accessor.rb:170:in `select'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/sandbox/file_accessor.rb:170:in `vendored_dynamic_frameworks'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/sandbox/file_accessor.rb:179:in `vendored_static_frameworks'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/sandbox/file_accessor.rb:292:in `vendored_static_artifacts'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/installer/xcode/target_validator.rb:82:in `each'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/installer/xcode/target_validator.rb:82:in `flat_map'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/installer/xcode/target_validator.rb:82:in `block (2 levels) in verify_no_static_framework_transitive_dependencies'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/installer/xcode/target_validator.rb:74:in `each_key'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/installer/xcode/target_validator.rb:74:in `block in verify_no_static_framework_transitive_dependencies'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/installer/xcode/target_validator.rb:73:in `each'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/installer/xcode/target_validator.rb:73:in `verify_no_static_framework_transitive_dependencies'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/installer/xcode/target_validator.rb:38:in `validate!'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/installer.rb:590:in `validate_targets'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/installer.rb:158:in `install!'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/command/install.rb:52:in `run'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/claide-1.0.3/lib/claide/command.rb:334:in `run'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/command.rb:52:in `run'
/Users/user/.rvm/rubies/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/bin/pod:55:in `<top (required)>'
/Users/user/.rvm/rubies/ruby-2.6.6/bin/pod:23:in `load'
/Users/user/.rvm/rubies/ruby-2.6.6/bin/pod:23:in `<main>'
/Users/user/.rvm/gems/ruby-2.6.6/bin/ruby_executable_hooks:24:in `eval'
/Users/user/.rvm/gems/ruby-2.6.6/bin/ruby_executable_hooks:24:in `<main>'
```
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[!] Oh no, an error occurred.
Search for existing GitHub issues similar to yours:
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