this is the configuration, the project is generated by nuxt, and the
browser cannot enter the breakpoint when requesting the interface of koa router. Why?
index.js:57 has an error
Error: listen EADDRINUSE 127.0.0.1 Error: listen EADDRINUSE
source-map-support.js:422
at Object._errnoException (util.js:1024:11)
at _exceptionWithHostPort (util.js:1046:20)
at Server.setupListenHandle [as _listen2] (net.js:1351:14)
at listenInCluster (net.js:1392:12)
at doListen (net.js:1501:7)
at _combinedTickCallback (internal/process/next_tick.js:141:11)
at process._tickCallback (internal/process/next_tick.js:180:9)