@vue/cli-service@4.5.15 upgrade to 5.0.8

run vue-cli-service serve

webpack report an error:

NormalModuleFactory.beforeResolve (IgnorePlugin) is no longer a waterfall hook, but a bailing hook instead. Do not return the passed object, but modify it instead. Returning false will ignore the request and results in no module created.
  Error: Child compilation failed:
  NormalModuleFactory.beforeResolve (IgnorePlugin) is no longer a waterfall hook, but a bailing hook instead. Do not return the passed object, but modify it instead. Returning false will ignore the request and results in no module created.

what reason?

thank u