Error: CredentialsSignin

백엔드소스 받아 로컬에 서버 가동시켰고, 레디스 서버도 켜두었고

강사님이 올려주신 클라이언트 ch4소스에서 실행시켜, 회원가입 도중 에러가 발생합니다.

postresql 디비에는 정상적으로 회원정보가 등록되긴 하였습니다만, 프론트에서 아래와 같은 에러가 있는데요

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Error: CredentialsSignin

at signIn (webpack-internal:///(action-browser)/./node_modules/next-auth/lib/actions.js:62:22)

at process.processTicksAndRejections (node:internal/process/task_queues:95:5)

at async $$ACTION_0 (webpack-internal:///(action-browser)/./src/app/(beforeLogin)/_lib/signup.ts:53:9)

at async /Users/yhj/Desktop/yhj_projects/next-app-router-z-master/ch4/node_modules/next/dist/compiled/next-server/app-page.runtime.dev.js:38:489

at async tX (/Users/yhj/Desktop/yhj_projects/next-app-router-z-master/ch4/node_modules/next/dist/compiled/next-server/app-page.runtime.dev.js:37:5313)

at async rl (/Users/yhj/Desktop/yhj_projects/next-app-router-z-master/ch4/node_modules/next/dist/compiled/next-server/app-page.runtime.dev.js:38:23339)

at async doRender (/Users/yhj/Desktop/yhj_projects/next-app-router-z-master/ch4/node_modules/next/dist/server/base-server.js:1406:30)

at async cacheEntry.responseCache.get.routeKind (/Users/yhj/Desktop/yhj_projects/next-app-router-z-master/ch4/node_modules/next/dist/server/base-server.js:1567:28)

at async DevServer.renderToResponseWithComponentsImpl (/Users/yhj/Desktop/yhj_projects/next-app-router-z-master/ch4/node_modules/next/dist/server/base-server.js:1475:28)

at async DevServer.renderPageComponent (/Users/yhj/Desktop/yhj_projects/next-app-router-z-master/ch4/node_modules/next/dist/server/base-server.js:1852:24)

at async DevServer.renderToResponseImpl (/Users/yhj/Desktop/yhj_projects/next-app-router-z-master/ch4/node_modules/next/dist/server/base-server.js:1890:32)

at async DevServer.pipeImpl (/Users/yhj/Desktop/yhj_projects/next-app-router-z-master/ch4/node_modules/next/dist/server/base-server.js:902:25)

at async NextNodeServer.handleCatchallRenderRequest (/Users/yhj/Desktop/yhj_projects/next-app-router-z-master/ch4/node_modules/next/dist/server/next-server.js:266:17)

at async DevServer.handleRequestImpl (/Users/yhj/Desktop/yhj_projects/next-app-router-z-master/ch4/node_modules/next/dist/server/base-server.js:798:17)