npm run dev 오류 (server)

• [0] (node:10908) Warning: Accessing non-existent property 'count' of module exports inside circular dependency
• [0] (Use `node --trace-warnings ...` to show where the warning was created)
• [0] (node:10908) Warning: Accessing non-existent property 'findOne' of module exports inside circular dependency
• [0] (node:10908) Warning: Accessing non-existent property 'remove' of module exports inside circular dependency
• [0] (node:10908) Warning: Accessing non-existent property 'updateOne' of module exports inside circular dependency
• [0] events.js:292
• [0]       throw er; // Unhandled 'error' event
• [0]       ^
• [0]
• [0] Error: listen EADDRINUSE: address already in use :::5000
• [0]     at Server.setupListenHandle [as _listen2] (net.js:1318:16)
• [0]     at listenInCluster (net.js:1366:12)
• [0]     at Server.listen (net.js:1452:7)
• [0]     at Function.listen (C:\Users\jimin\Downloads\boilerplate-mern-stack-master\boilerplate-mern-stack-master\node_modules\express\lib\application.js:618:24)
• [0]     at Object.<anonymous> (C:\Users\jimin\Downloads\boilerplate-mern-stack-master\boilerplate-mern-stack-master\server\index.js:58:5)
• [0]     at Module._compile (internal/modules/cjs/loader.js:1063:30)
• [0]     at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
• [0]     at Module.load (internal/modules/cjs/loader.js:928:32)
• [0]     at Function.Module._load (internal/modules/cjs/loader.js:769:14)
• [0]     at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12)
• [0]     at internal/main/run_main_module.js:17:47
• [0] Emitted 'error' event on Server instance at:

[0]     at emitErrorNT (net.js:1345:8)

• [0]     at processTicksAndRejections (internal/process/task_queues.js:80:21) {
• [0]   code: 'EADDRINUSE',
• [0]   errno: -4091,
• [0]   syscall: 'listen',
• [0]   address: '::',
• [0]   port: 5000
• [0] }
• [0] [nodemon] app crashed - waiting for file changes before starting...

이렇게 오류가 납니다. localhost:3000 포트에서는 정상적으로 잘 작동이 되더만, localhost:5000 포트에서는 Error Cannot GET /가 뜹니다. 왜 이런걸까요? ㅠ