$ gradle clean
Starting a Gradle Daemon, 1 stopped Daemon could not be reused, use --status for details

FAILURE: Build failed with an exception.

* What went wrong:
Could not create service of type FileHasher using GradleUserHomeScopeServices.createCachingFileHasher().
> Timeout waiting to lock file hash cache (/Users/***/.gradle/caches/5.2.1/fileHashes). It is currently in use by another Gradle instance.
  Owner PID: 9193
  Our PID: 10083
  Owner Operation: 
  Our operation: 
  Lock file: /Users/***/.gradle/caches/5.2.1/fileHashes/fileHashes.lock

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 1m 13s


FAILURE: Build failed with an exception.

* What went wrong:
Could not create service of type FileAccessTimeJournal using GradleUserHomeScopeServices.createFileAccessTimeJournal().
> Timeout waiting to lock journal cache (/Users/***/.gradle/caches/journal-1). It is currently in use by another Gradle instance.
  Owner PID: 9193
  Our PID: 10083
  Owner Operation: 
  Our operation: 
  Lock file: /Users/***/.gradle/caches/journal-1/journal-1.lock

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org
BUILD FAILED in 1m 0s

上面的报错可以通过下面的命令解决：
find ~/.gradle -type f -name "*.lock" | while read f; do rm $f; done