我在这个主要用于ios部署的Flutter项目上工作了大约4个月，我们不得不重新访问该项目以进行一些更改。工作正常。我必须将firebase_crashlytics添加到项目中。因此，当我添加它时，弹出一个错误消息：
The current Flutter SDK version is 1.9.1+hotfix.4.
Because vitalsmobile depends on firebase_crashlytics >=0.1.2 which requires Flutter SDK version >=1.9.1+hotfix.5 <2.0.0, version solving failed.
pub get failed
所以我还原并尝试为ios模拟器进行编译，以检查是否一切正常，并且iOS抛出此错误：
PhaseScriptExecution [CP]\ Embed\ Pods\ Frameworks /Users/ag32547/Library/Developer/Xcode/DerivedData/Runner-ehsppxamrnwyncckggzztyutcqwg/Build/Intermediates.noindex/Runner.build/Debug-iphonesimulator/Runner.build/Script-62580339D8295FD31996B914.sh (in target 'Runner' from project 'Runner')
cd /Users/ag32547/Documents/GitHub/vitalsmobileboilerplate/ios
/bin/sh -c /Users/ag32547/Library/Developer/Xcode/DerivedData/Runner-ehsppxamrnwyncckggzztyutcqwg/Build/Intermediates.noindex/Runner.build/Debug-iphonesimulator/Runner.build/Script-62580339D8295FD31996B914.sh
mkdir -p /Users/ag32547/Library/Developer/Xcode/DerivedData/Runner-ehsppxamrnwyncckggzztyutcqwg/Build/Products/Debug-iphonesimulator/Runner.app/Frameworks
rsync --delete -av --filter P .*.?????? --filter "- CVS/" --filter "- .svn/" --filter "- .git/" --filter "- .hg/" --filter "- Headers" --filter "- PrivateHeaders" --filter "- Modules" "/Users/ag32547/Documents/GitHub/vitalsmobileboilerplate/ios/Pods/../Flutter/Flutter.framework" "/Users/ag32547/Library/Developer/Xcode/DerivedData/Runner-ehsppxamrnwyncckggzztyutcqwg/Build/Products/Debug-iphonesimulator/Runner.app/Frameworks"
building file list ... done
Flutter.framework/
Flutter.framework/Flutter
Flutter.framework/Info.plist
Flutter.framework/icudtl.dat
Flutter.framework/_CodeSignature/
Flutter.framework/_CodeSignature/CodeResources
sent 94440040 bytes received 120 bytes 62960106.67 bytes/sec
total size is 94428117 speedup is 1.00
Stripped /Users/ag32547/Library/Developer/Xcode/DerivedData/Runner-ehsppxamrnwyncckggzztyutcqwg/Build/Products/Debug-iphonesimulator/Runner.app/Frameworks/Flutter.framework/Flutter of architectures: armv7 arm64
Code Signing /Users/ag32547/Library/Developer/Xcode/DerivedData/Runner-ehsppxamrnwyncckggzztyutcqwg/Build/Products/Debug-iphonesimulator/Runner.app/Frameworks/Flutter.framework with Identity -
/usr/bin/codesign --force --sign - --preserve-metadata=identifier,entitlements '/Users/ag32547/Library/Developer/Xcode/DerivedData/Runner-ehsppxamrnwyncckggzztyutcqwg/Build/Products/Debug-iphonesimulator/Runner.app/Frameworks/Flutter.framework'
/Users/ag32547/Library/Developer/Xcode/DerivedData/Runner-ehsppxamrnwyncckggzztyutcqwg/Build/Products/Debug-iphonesimulator/Runner.app/Frameworks/Flutter.framework: replacing existing signature
/Users/ag32547/Library/Developer/Xcode/DerivedData/Runner-ehsppxamrnwyncckggzztyutcqwg/Build/Products/Debug-iphonesimulator/Runner.app/Frameworks/Flutter.framework: Permission denied
Command PhaseScriptExecution failed with a nonzero exit code
我不知道哪里出了问题。
我接受旧项目后所做的全部修改是：
如果需要更多信息，我准备提供它。任何对此的见解将非常有帮助。谢谢。
我在应用中设置Firebase时发生了问题。我在xcode编辑器中更改了该应用程序，但这不是必需的。 Flutter会为您照顾好它。因此，在运行命令时，将命令添加到fluter中非常重要。
我还删除了Podfile.lock，pod文件和.xcworkspace，并从终端运行了pod安装和升级。而且我还运行了“干净”并重新编译。