failed to start dev tools flutter mac code example

Example: failed to start dev tools flutter mac

~/tools/flutter/bin/cache/dart-sdk/bin/pub global list

~/tools/flutter/bin/cache/dart-sdk/bin/pub global deactivate devtools

~/tools/flutter/bin/cache/dart-sdk/bin/pub global activate devtools

~/tools/flutter/bin/cache/dart-sdk/bin/pub global run devtools