在 Flutter 中为 iOS 构建设备时遇到错误，我尝试了很多方法但还没有解决方案。此问题发生在 flutter firebase 项目中，并且发布卡住了 4 天以上。请指导我尽快解决这个问题
> Error output from Xcode build: ?
> 2020-09-04 19:28:49.310 xcodebuild[12210:62950] warning: The file reference for
> "Objective-C/TOCropViewController/Models/TOActivityCroppedImageProvider.h"
> is a member of
> multiple groups ("TOCropViewController" and "TOCropViewController"); this indicates a malformed project. Only the
> membership in one of the groups will be preserved (but
> membership in targets will be unaffected). If you want a reference to the same file in more than one group, please add …