Because every version of flutter_test from sdk depends on vm_service 15.0.0 and every version of flutterflow_debug_panel from git depends on vm_service ^14.3.0, flutter_test from sdk is incompatible with flutterflow_debug_panel from git.
So, because fitness depends on both flutterflow_debug_panel from git and flutter_test from sdk, version solving failed.
Failed to update packages.

errror in windows 10 and macbook