sbt package报错：a bytes-like object is required, not 'str'

Traceback (most recent call last):
  File "C:\Users\User\AppData\Local\Temp\protocbridge7256923893821185625.py", line , in <module>
    s.sendall(content)
TypeError: a bytes-like object is required, not 'str'
--scala_out: protoc-gen-scala: Plugin failed with status code .
[error] java.lang.RuntimeException: protoc returned exit code:
[error]         at scala.sys.package$.error(package.scala:)
[error]         at sbtprotoc.ProtocPlugin$.compile(ProtocPlugin.scala:)
[error]         at sbtprotoc.ProtocPlugin$.compileProto$(ProtocPlugin.scala:)
[error]         at sbtprotoc.ProtocPlugin$.$anonfun$sourceGeneratorTask$(ProtocPlugin.scala:)
[error]         at sbt.util.FileFunction$.$anonfun$cached$(FileFunction.scala:)
[error]         at sbt.util.FileFunction$.$anonfun$cached$(FileFunction.scala:)
[error]         at sbt.util.Difference.apply(Tracked.scala:)
[error]         at sbt.util.Difference.apply(Tracked.scala:)
[error]         at sbt.util.FileFunction$.$anonfun$cached$(FileFunction.scala:)
[error]         at sbt.util.Difference.apply(Tracked.scala:)
[error]         at sbt.util.Difference.apply(Tracked.scala:)
[error]         at sbt.util.FileFunction$.$anonfun$cached$(FileFunction.scala:)
[error]         at sbtprotoc.ProtocPlugin$.$anonfun$sourceGeneratorTask$(ProtocPlugin.scala:)
[error]         at scala.Function1.$anonfun$compose$(Function1.scala:)
[error]         at sbt.internal.util.$tilde$greater.$anonfun$$u2219$(TypeFunctions.scala:)
[error]         at sbt.std.Transform$$anon$.work(System.scala:)
[error]         at sbt.Execute.$anonfun$submit$(Execute.scala:)
[error]         at sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:)
[error]         at sbt.Execute.work(Execute.scala:)
[error]         at sbt.Execute.$anonfun$submit$(Execute.scala:)
[error]         at sbt.ConcurrentRestrictions$$anon$.$anonfun$submitValid$(ConcurrentRestrictions.scala:)
[error]         at sbt.CompletionService$$anon$.call(CompletionService.scala:)
[error]         at java.util.concurrent.FutureTask.run(FutureTask.java:)
[error]         at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:)
[error]         at java.util.concurrent.FutureTask.run(FutureTask.java:)
[error]         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:)
[error]         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:)
[error]         at java.lang.Thread.run(Thread.java:)
[error] (Compile / protocGenerate) protoc returned exit code:
[error] Total time:  s, completed -- ::

搜索了一下，根据https://github.com/scalapb/ScalaPB/issues/268的讨论，可能是安装的python版本问题，非2.x版本可能导致sbt package时出现上面的错误。安装python 2.7后问题解决。