Exception message: What? black already exists?{'DEFAULT': {'jvm_options': ['-Xmx1g'], 'local_artifact_cache': '%(pants_bootstrapdir)s/artifact_cache'}, 'GLOBAL': {'print_exception_stacktrace': True, 'v2': False, 'pythonpath': ['%(buildroot)s/contrib/avro/src/python', '%(buildroot)s/contrib/awslambda/python/src/python', '%(buildroot)s/contrib/buildrefactor/src/python', '%(buildroot)s/contrib/codeanalysis/src/python', '%(buildroot)s/contrib/cpp/src/python', '%(buildroot)s/contrib/confluence/src/python', '%(buildroot)s/contrib/errorprone/src/python', '%(buildroot)s/contrib/findbugs/src/python', '%(buildroot)s/contrib/go/src/python', '%(buildroot)s/contrib/googlejavaformat/src/python', '%(buildroot)s/contrib/jax_ws/src/python', '%(buildroot)s/contrib/mypy/src/python', '%(buildroot)s/contrib/node/src/python', '%(buildroot)s/contrib/scalajs/src/python', '%(buildroot)s/contrib/scrooge/src/python', '%(buildroot)s/contrib/thrifty/src/python', '%(buildroot)s/pants-plugins/src/python'], 'backend_packages': {'add': ['pants.backend.docgen', 'pants.contrib.avro', 'pants.contrib.awslambda.python', 'pants.contrib.buildrefactor', 'pants.contrib.codeanalysis', 'pants.contrib.cpp', 'pants.contrib.confluence', 'pants.contrib.errorprone', 'pants.contrib.findbugs', 'pants.contrib.go', 'pants.contrib.googlejavaformat', 'pants.contrib.jax_ws', 'pants.contrib.scalajs', 'pants.contrib.node', 'pants.contrib.scrooge', 'pants.contrib.thrifty', 'internal_backend.repositories', 'internal_backend.sitegen', 'internal_backend.utilities'], 'remove': ['pants.backend.python.lint.isort']}, 'backend_packages2': ['pants.backend.project_info', 'pants.backend.python', 'pants.backend.python.lint.black', 'pants.backend.python.lint.docformatter', 'pants.backend.python.lint.flake8', 'pants.backend.python.lint.isort', 'pants.backend.native', 'internal_backend.rules_for_testing'], 'ignore_pants_warnings': ['DEPRECATED: the pantsbuild.pants.contrib', 'DEPRECATED: the antlr, jaxb, ragel, and wire codegen backends'], 'pantsd_invalidation_globs': {'add': ['src/python/**/*.py']}, 'pants_ignore': {'add': ['/build-support/virtualenvs/', '/build-support/*.venv/', '/build-support/bin/native/src', '/src/rust/engine/target', '!*.class', '!/pants.pex']}}, 'black': {'args': ['--quiet']}, 'cache': {'read_from': [], 'write_to': [], 'bootstrap': {'read_from': ['%(local_artifact_cache)s'], 'write_to': ['%(local_artifact_cache)s']}}, 'ivy': {'ivy_settings': '%(pants_supportdir)s/ivy/ivysettings.xml', 'ivy_profile': '%(pants_supportdir)s/ivy/ivy.xml'}, 'gen': {'scrooge': {'service_deps': "{\n  'java': [\n    '3rdparty:slf4j-api',\n    '3rdparty:thrift',\n    '3rdparty/jvm/com/twitter:finagle-thrift',\n    '3rdparty/jvm/com/twitter:scrooge-core',\n  ],\n  'scala': [\n    '3rdparty:thrift',\n    '3rdparty/jvm/com/twitter:finagle-thrift',\n    '3rdparty/jvm/com/twitter:scrooge-core',\n  ],\n}\n", 'structs_deps': "{\n  'java': [\n    '3rdparty:thrift',\n    '3rdparty/jvm/com/twitter:scrooge-core',\n  ],\n  'scala': [\n    '3rdparty:thrift',\n    '3rdparty/jvm/com/twitter:scrooge-core',\n  ],\n}\n", 'service_exports': "{\n  'java': [\n    '3rdparty:thrift',\n  ],\n  'scala': [\n    '3rdparty:thrift',\n    '3rdparty/jvm/com/twitter:finagle-thrift',\n    '3rdparty/jvm/com/twitter:scrooge-core',\n  ],\n}\n", 'structs_exports': "{\n  'java': [\n    '3rdparty:thrift',\n  ],\n  'scala': [\n    '3rdparty:thrift',\n    '3rdparty/jvm/com/twitter:scrooge-core',\n  ],\n}\n"}, 'thrift-java': {'deps': ['3rdparty:thrift']}, 'thrift-py': {'deps': ['examples/3rdparty/python:thrift']}, 'thrifty': {'allow_dups': True}, 'antlr-py': {'antlr3_deps': ['3rdparty/python:antlr-3.1.3']}, 'go-protobuf': {'import_target': 'contrib/go/examples/src/protobuf/org/pantsbuild/example:protobuf-deps'}}, 'compile': {'errorprone': {'command_line_options': ['-Xep:CatchAndPrintStackTrace:OFF', '-Xep:StringSplitter:OFF'], 'exclude_patterns': ['contrib/errorprone/tests/java/org/pantsbuild/contrib/errorprone:error', 'testprojects/src/java/org/pantsbuild/testproject/.*']}, 'findbugs': {'max_rank': 4, 'fail_on_error': True, 'exclude_patterns': ['contrib/findbugs/tests/java/org/pantsbuild/contrib/findbugs:high', 'testprojects/src/java/org/pantsbuild/testproject/.*']}, 'rsc': {'jvm_options': ['-Xmx4g', '-XX:+UseConcMarkSweepGC', '-XX:ParallelGCThreads=4'], 'args': ['-C-encoding', '-CUTF-8', '-S-encoding', '-SUTF-8', '-S-g:vars', '-S-target:jvm-1.8'], 'warning_args': ['-S-deprecation', '-S-unchecked', '-S-feature'], 'no_warning_args': ['-S-nowarn']}, 'javac': {'args': ['-encoding', 'UTF-8', '-J-Xmx2g'], 'warning_args': ['-Xlint:deprecation', '-Xlint:empty', '-Xlint:finally', '-Xlint:overrides', '-Xlint:static', '-Xlint:unchecked', '-Xlint:try'], 'no_warning_args': ['-Xlint:none']}}} (line 252 column 1 char 7304)