Iniciando yarn no front-end

[Calleu Arruda Oliveira]

Realizei todo o processo de instalação do back-end e deu tudo certo, segui tudo na documentação, mas quando fui iniciar o yarn para o frotn-end ele dá esse erro e não sei como prosseguir, podem me ajudar ?

A instalação é local (por enquanto). Back-end na porta 8080 e front-end na 4000

[Calleu Arruda Oliveira]

DSpace 7.0 seguindo a documentação, Ubuntu-SERVER 20.04

[Cerceau]

o pessoal esta relatando que o YARN e o ANGULAR precisam  estar na versao atualizada.

Diversos erros estao relatados aqui: Troubleshoot an error - DSpace - LYRASIS Wiki

E, tambem nas lista  [dspace-tech]

To view this discussion on the web visit https://groups.google.com/d/msgid/dspace-tech/DM5PR2201MB1148FDE061649B13231E6D22EDF89%40DM5PR2201MB1148.namprd22.prod.outlook.com.

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[Calleu Arruda Oliveira]

Está na versão atualizada conforme o manual

Mas agora tenho outro erro alguém poderia me ajudar ?

Error: listen EADDRINUSE: address already in use 127.0.0.1:4000

    at Server.setupListenHandle [as _listen2] (net.js:1320:16)

    at listenInCluster (net.js:1368:12)

    at GetAddrInfoReqWrap.doListen [as callback] (net.js:1505:7)

    at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:71:8)

Emitted 'error' event on Server instance at:

    at emitErrorNT (net.js:1347:8)

    at ZoneDelegate.invokeTask (/home/dspace/dspace-angular-dspace-7.0/dist/server.js:1022:35)

    at Zone.runTask (/home/dspace/dspace-angular-dspace-7.0/dist/server.js:789:51)

    at ZoneTask.invokeTask (/home/dspace/dspace-angular-dspace-7.0/dist/server.js:1104:38)

    at ZoneTask.invoke (/home/dspace/dspace-angular-dspace-7.0/dist/server.js:1093:52)

    at data.args.<computed> (/home/dspace/dspace-angular-dspace-7.0/dist/server.js:2045:63)

    at processTicksAndRejections (internal/process/task_queues.js:82:21) {

  code: 'EADDRINUSE',

  errno: -98,

  syscall: 'listen',

  address: '127.0.0.1',

  port: 4000

Ubuntu 20.04, tomcat 9.0.52

[Calleu Arruda Oliveira]

Hi, Could someone help me in this problem?