Project normal compile, install machine mode (development phase has been no problem), suddenly all references where dart internal library error (import "package/futter/m *") only references like this error, (normal) write their own pure dart files, is this what the causes of the great god is


Attached: the android studio setup such as configuration flutter SDK directory, and use the default dart SDK these problems disappear but cannot choose equipment, such as the dart SDK to the specified directory can choose equipment, at the same time, the above problems