Ios 颤振吊舱安装失败-'；无效的'Podfile'文件没有将nil隐式转换为字符串

我克隆了这个可穿戴的项目

正在运行pod安装。。。 椰子荚的产量： ↳

[！]无效的'Podfile'文件：没有将nil隐式转换为字符串。
#from/Volumes/Storage/瓶子/Wearables/flatter\u os\u wear/ios/Podfile:57
#  -------------------------------------------
#除非文件.exist？（复制的\u框架\u路径）
>cp\r（File.join（缓存的\u framework\u dir，'flatter.framework'），复制的\u flatter\u dir）
#结束
#  -------------------------------------------
/Library/Ruby/Gems/2.6.0/Gems/cocoapods-core-1.9.3/lib/cocoapods-core/podfile.rb:301:“从Ruby中解救块中”
/Library/Ruby/Gems/2.6.0/Gems/cocoapods-core-1.9.3/lib/cocoapods-core/podfile.rb:295:in“block in from_Ruby”
/Library/Ruby/Gems/2.6.0/Gems/cocoapods-core-1.9.3/lib/cocoapods-core/podfile.rb:50:in'instance_eval'
/Library/Ruby/Gems/2.6.0/Gems/cocoapods-core-1.9.3/lib/cocoapods-core/podfile.rb:50:in'initialize'
/Library/Ruby/Gems/2.6.0/Gems/cocoapods-core-1.9.3/lib/cocoapods-core/podfile.rb:293:in'new'
/Library/Ruby/Gems/2.6.0/Gems/cocoapods-core-1.9.3/lib/cocoapods-core/podfile.rb:293:in“from_Ruby”
/Library/Ruby/Gems/2.6.0/Gems/cocoapods-core-1.9.3/lib/cocoapods-core/podfile.rb:259:in“from_文件”
/Library/Ruby/Gems/2.6.0/Gems/cocoapods-1.9.3/lib/cocoapods/config.rb:200:in'podfile'
/Library/Ruby/Gems/2.6.0/Gems/cocoapods-1.9.3/lib/cocoapods/command.rb:150:在“验证podfile是否存在”中
/Library/Ruby/Gems/2.6.0/Gems/cocoapods-1.9.3/lib/cocoapods/command/install.rb:46:in'run'
/Library/Ruby/Gems/2.6.0/Gems/claide-1.0.3/lib/claide/command.rb:334:in'run'
/Library/Ruby/Gems/2.6.0/Gems/cocoapods-1.9.3/lib/cocoapods/command.rb:52:in'run'
/Library/Ruby/Gems/2.6.0/Gems/cocoapods-1.9.3/bin/pod:55:in`'
/usr/local/bin/pod:23:in“装载”
/usr/local/bin/pod:23:in`'

CoCoapod的错误输出： ↳

---

忽略ffi-1.12.2，因为未构建其扩展。Try:gem pristine ffi--version 1.12.2

尝试在${PROJECT}/ios/Podfile中取消注释这行平台：ios，'8.0'，并将其设置为更高版本（如9.0）.

它已经安装了编辑已经9我已经更新到10.0，但错误仍然存在创建新项目并将克隆的回购迁移到其中并尝试运行它我认为它应该可以运行，嗯，好的，我会尝试that@AmarMaharjan你解决了吗。因为我也有同样的问题

[!] Invalid `Podfile` file: no implicit conversion of nil into String.

 #  from /Volumes/Storage/Bottle/Wearables/flutter_os_wear/ios/Podfile:57
 #  -------------------------------------------
 #      unless File.exist?(copied_framework_path)
 >        FileUtils.cp_r(File.join(cached_framework_dir, 'Flutter.framework'), copied_flutter_dir)
 #      end
 #  -------------------------------------------

/Library/Ruby/Gems/2.6.0/gems/cocoapods-core-1.9.3/lib/cocoapods-core/podfile.rb:301:in `rescue in block in from_ruby'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-core-1.9.3/lib/cocoapods-core/podfile.rb:295:in `block in from_ruby'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-core-1.9.3/lib/cocoapods-core/podfile.rb:50:in `instance_eval'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-core-1.9.3/lib/cocoapods-core/podfile.rb:50:in `initialize'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-core-1.9.3/lib/cocoapods-core/podfile.rb:293:in `new'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-core-1.9.3/lib/cocoapods-core/podfile.rb:293:in `from_ruby'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-core-1.9.3/lib/cocoapods-core/podfile.rb:259:in `from_file'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/config.rb:200:in `podfile'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/command.rb:150:in `verify_podfile_exists!'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/command/install.rb:46:in `run'
/Library/Ruby/Gems/2.6.0/gems/claide-1.0.3/lib/claide/command.rb:334:in `run'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/command.rb:52:in `run'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/bin/pod:55:in `<top (required)>'
/usr/local/bin/pod:23:in `load'
/usr/local/bin/pod:23:in `<main>'