Null check operator used on null value exception when using nested workspaces #4652
Description
I get his error when running melos bs command. I'm using nested workspaces. meaning the pubspec.yaml file of a child workspace is added as package to the pubspec.yaml of parent workspace
Resolving dependencies... (1.1s)
Null check operator used on a null value
package:pub/src/solver/partial_solution.dart 163:23 PartialSolution.satisfier
package:pub/src/solver/version_solver.dart 305:25 VersionSolver._resolveConflict
package:pub/src/solver/version_solver.dart 170:29 VersionSolver._propagate
package:pub/src/solver/version_solver.dart 132:11 VersionSolver.solve.<fn>
===== asynchronous gap ===========================
package:pub/src/source/hosted.dart 1768:14 HostedSource.withPrefetching.<fn>
===== asynchronous gap ===========================
package:pub/src/rate_limited_scheduler.dart 113:14 RateLimitedScheduler.withPrescheduling
===== asynchronous gap ===========================
package:pub/src/source/hosted.dart 1767:12 HostedSource.withPrefetching
===== asynchronous gap ===========================
package:pub/src/solver/version_solver.dart 129:14 VersionSolver.solve
===== asynchronous gap ===========================
package:pub/src/progress.dart 61:3 Progress.stop
===== asynchronous gap ===========================
package:pub/src/entrypoint.dart 583:16 Entrypoint.acquireDependencies
===== asynchronous gap ===========================
package:pub/src/command/get.dart 80:5 GetCommand.runProtected
===== asynchronous gap ===========================
package:pub/src/command.dart 197:7 PubCommand.run
===== asynchronous gap ===========================
package:args/command_runner.dart 212:13 CommandRunner.runCommand
===== asynchronous gap ===========================
package:dartdev/dartdev.dart 255:18 DartdevRunner.runCommand
===== asynchronous gap ===========================
package:dartdev/dartdev.dart 48:16 runDartdev
===== asynchronous gap ===========================
/Volumes/Work/s/w/ir/x/w/sdk/pkg/dartdev/bin/dartdev.dart 13:5 main
This is an unexpected error. The full log and other details are collected in:
/Users/alirezaeasazade/.pub-cache/log/pub_log.txt
Consider creating an issue on https://github.com/dart-lang/pub/issues/new
and attaching the relevant parts of that log file.[](url)