Error: It seems that you are running multiple instances of the emulator suite

### [REQUIRED] Environment info

8.2.0
**firebase-tools:**

**Platform:**
Macos
### [REQUIRED] Test case

https://github.com/QuantumInformation/svelte-fullstack-starter

### [REQUIRED] Steps to reproduce

Run `firebase emulators:start` at the root of the above url
### [REQUIRED] Expected behavior
emulator to start

### [REQUIRED] Actual behavior
the following output


debug log:

```
svelte-fullstack-starter git:(master) firebase emulators:start --debug
[2020-05-09T19:44:10.572Z] > command requires scopes: ["email","openid","https://www.googleapis.com/auth/cloudplatformprojects.readonly","https://www.googleapis.com/auth/firebase","https://www.googleapis.com/auth/cloud-platform"]
[2020-05-09T19:44:10.574Z] > authorizing via signed-in user
i emulators: Starting emulators: functions, firestore, database, hosting, pubsub
⚠ emulators: It seems that you are running multiple instances of the emulator suite for project svelte-fullstack-starter. This may result in unexpected behavior.
[2020-05-09T19:44:10.593Z] [hub] writing locator at /var/folders/wk/xpjrzzgj0937n2ys2j951wyr0000gn/T/hub-svelte-fullstack-starter.json
✔ hub: emulator hub started at http://localhost:4400
⚠ Your requested "node" version "8" doesn't match your global version "12"
✔ functions: functions emulator started at http://localhost:5002
⚠ firestore: Did not find a Cloud Firestore rules file specified in a firebase.json config file.
⚠ firestore: The emulator will default to allowing all reads and writes. Learn more about this option: https://firebase.google.com/docs/emulator-suite/install_and_configure#security_rules_configuration.
[2020-05-09T19:44:10.875Z] Ignoring unsupported arg: projectId
[2020-05-09T19:44:10.875Z] Ignoring unsupported arg: auto_download
[2020-05-09T19:44:10.875Z] Starting firestore emulator with command {"binary":"java","args":["-Duser.language=en","-jar","/Users/nikos/.cache/firebase/emulators/cloud-firestore-emulator-v1.11.3.jar","--host","localhost","--port",8080,"--functions_emulator","localhost:5002"],"optionalArgs":["port","webchannel_port","host","rules","functions_emulator","seed_from_export"],"joinArgs":false}
i firestore: firestore emulator logging to firestore-debug.log
[2020-05-09T19:44:11.974Z] API endpoint: http://localhost:
[2020-05-09T19:44:11.974Z] 8080
If you are using a library that supports the FIRESTORE_EMULATOR_HOST environment variable, run:

export FIRESTORE_EMULATOR_HOST=localhost:8080

Dev App Server is now running.

✔ firestore: firestore emulator started at http://localhost:8080
i firestore: For testing set FIRESTORE_EMULATOR_HOST=localhost:8080
⚠ database: Did not find a Realtime Database rules file specified in a firebase.json config file.
⚠ database: The emulator will default to allowing all reads and writes. Learn more about this option: https://firebase.google.com/docs/emulator-suite/install_and_configure#security_rules_configuration.
[2020-05-09T19:44:12.158Z] Ignoring unsupported arg: projectId
[2020-05-09T19:44:12.158Z] Ignoring unsupported arg: auto_download
[2020-05-09T19:44:12.158Z] Starting database emulator with command {"binary":"java","args":["-Duser.language=en","-jar","/Users/nikos/.cache/firebase/emulators/firebase-database-emulator-v4.4.1.jar","--host","localhost","--port",9000,"--functions_emulator_host","localhost","--functions_emulator_port",5002],"optionalArgs":["port","host","functions_emulator_port","functions_emulator_host"],"joinArgs":false}
i database: database emulator logging to database-debug.log
[2020-05-09T19:44:13.695Z] 21:44:13.694 [NamespaceSystem-akka.actor.default-dispatcher-5] INFO akka.event.slf4j.Slf4jLogger - Slf4jLogger started

[2020-05-09T19:44:13.874Z] 21:44:13.873 [main] INFO com.firebase.server.forge.App$ - Listening at localhost:9000

✔ database: database emulator started at http://localhost:9000
i database: For testing set FIREBASE_DATABASE_EMULATOR_HOST=localhost:9000
[2020-05-09T19:44:13.950Z] > refreshing access token with scopes: ["email","https://www.googleapis.com/auth/cloud-platform","https://www.googleapis.com/auth/cloudplatformprojects.readonly","https://www.googleapis.com/auth/firebase","openid"]
[2020-05-09T19:44:13.950Z] >>> HTTP REQUEST POST https://www.googleapis.com/oauth2/v3/token

[2020-05-09T19:44:14.125Z] <<< HTTP RESPONSE 200 {"content-type":"application/json; charset=utf-8","vary":"X-Origin, Referer, Origin,Accept-Encoding","date":"Sat, 09 May 2020 19:44:14 GMT","server":"scaffolding on HTTPServer2","cache-control":"private","x-xss-protection":"0","x-frame-options":"SAMEORIGIN","x-content-type-options":"nosniff","alt-svc":"h3-27=\":443\"; ma=2592000,h3-25=\":443\"; ma=2592000,h3-Q050=\":443\"; ma=2592000,h3-Q049=\":443\"; ma=2592000,h3-Q048=\":443\"; ma=2592000,h3-Q046=\":443\"; ma=2592000,h3-Q043=\":443\"; ma=2592000,quic=\":443\"; ma=2592000; v=\"46,43\"","accept-ranges":"none","transfer-encoding":"chunked"}
[2020-05-09T19:44:14.137Z] >>> HTTP REQUEST GET https://firebase.googleapis.com/v1beta1/projects/svelte-fullstack-starter/webApps/-/config

[2020-05-09T19:44:14.786Z] <<< HTTP RESPONSE 200 {"content-type":"application/json; charset=UTF-8","vary":"X-Origin, Referer, Origin,Accept-Encoding","date":"Sat, 09 May 2020 19:44:14 GMT","server":"ESF","cache-control":"private","x-xss-protection":"0","x-frame-options":"SAMEORIGIN","x-content-type-options":"nosniff","alt-svc":"h3-27=\":443\"; ma=2592000,h3-25=\":443\"; ma=2592000,h3-Q050=\":443\"; ma=2592000,h3-Q049=\":443\"; ma=2592000,h3-Q048=\":443\"; ma=2592000,h3-Q046=\":443\"; ma=2592000,h3-Q043=\":443\"; ma=2592000,quic=\":443\"; ma=2592000; v=\"46,43\"","accept-ranges":"none","transfer-encoding":"chunked"}
i hosting: Serving hosting files from: public
✔ hosting: Local server: http://localhost:5000
✔ hosting: hosting emulator started at http://localhost:5000
[2020-05-09T19:44:14.811Z] Ignoring unsupported arg: projectId
[2020-05-09T19:44:14.811Z] Ignoring unsupported arg: auto_download
[2020-05-09T19:44:14.811Z] Starting pubsub emulator with command {"binary":"/Users/nikos/.cache/firebase/emulators/pubsub-emulator-0.1.0/pubsub-emulator/bin/cloud-pubsub-emulator","args":["--host=localhost","--port=8085"],"optionalArgs":["port","host"],"joinArgs":true}
i pubsub: pubsub emulator logging to pubsub-debug.log
[2020-05-09T19:44:14.985Z] This is the Google Pub/Sub fake.

[2020-05-09T19:44:14.986Z] Implementation may be incomplete or differ from the real system.

[2020-05-09T19:44:15.015Z] May 09, 2020 9:44:14 PM com.google.cloud.pubsub.testing.v1.Main main
INFO: IAM integration is disabled. IAM policy methods and ACL checks are not supported

[2020-05-09T19:44:15.547Z] May 09, 2020 9:44:15 PM io.gapi.emulators.netty.NettyUtil applyJava7LongHostnameWorkaround
INFO: Unable to apply Java 7 long hostname workaround.

[2020-05-09T19:44:15.630Z] May 09, 2020 9:44:15 PM com.google.cloud.pubsub.testing.v1.Main main
INFO: Server started, listening on 8085

✔ pubsub: pubsub emulator started at http://localhost:8085
i functions: Watching "/Users/nikos/WebstormProjects/svelte-fullstack-starter/functions" for Cloud Functions...
[2020-05-09T19:44:15.845Z] [worker-pool] addWorker(~diagnostic~)
[2020-05-09T19:44:15.846Z] [worker-pool] Adding worker with key ~diagnostic~, total=1
[2020-05-09T19:44:15.846Z] [worker-pool] submitWork(triggerId=)
[2020-05-09T19:44:15.847Z] [worker-~diagnostic~-d5e3219e-99af-4c9f-85e3-90482760af04]: Assigning socketPath: /var/folders/wk/xpjrzzgj0937n2ys2j951wyr0000gn/T/fire_emu_31830.sock
[2020-05-09T19:44:15.847Z] [worker-~diagnostic~-d5e3219e-99af-4c9f-85e3-90482760af04]: BUSY
[2020-05-09T19:44:15.991Z] May 09, 2020 9:44:15 PM io.gapi.emulators.grpc.GrpcServer$3 operationComplete
INFO: Adding handler(s) to newly registered Channel.

[2020-05-09T19:44:16.076Z] [runtime-status] [31830] Functions runtime initialized. {"cwd":"/Users/nikos/WebstormProjects/svelte-fullstack-starter/functions","node_version":"12.13.1"}
[2020-05-09T19:44:16.077Z] [runtime-status] [31830] Disabled runtime features: undefined
[2020-05-09T19:44:16.080Z] [runtime-status] [31830] Resolved module firebase-admin {"declared":true,"installed":true,"version":"8.12.1","resolution":"/Users/nikos/WebstormProjects/svelte-fullstack-starter/functions/node_modules/firebase-admin/lib/index.js"}
[2020-05-09T19:44:16.082Z] [runtime-status] [31830] Resolved module firebase-functions {"declared":true,"installed":true,"version":"3.6.1","resolution":"/Users/nikos/WebstormProjects/svelte-fullstack-starter/functions/node_modules/firebase-functions/lib/index.js"}
[2020-05-09T19:44:16.082Z] [runtime-status] [31830] Set PUBSUB_EMULATOR_HOST to localhost:8085
[2020-05-09T19:44:16.085Z] [runtime-status] [31830] Outgoing network have been stubbed. [{"name":"http","status":"mocked"},{"name":"http","status":"mocked"},{"name":"https","status":"mocked"},{"name":"https","status":"mocked"},{"name":"net","status":"mocked"}]
[2020-05-09T19:44:16.133Z] [runtime-status] [31830] Checked functions.config() {"config":{}}
[2020-05-09T19:44:16.133Z] [runtime-status] [31830] Resolved module firebase-functions {"declared":true,"installed":true,"version":"3.6.1","resolution":"/Users/nikos/WebstormProjects/svelte-fullstack-starter/functions/node_modules/firebase-functions/lib/index.js"}
[2020-05-09T19:44:16.134Z] [runtime-status] [31830] Resolved module firebase-admin {"declared":true,"installed":true,"version":"8.12.1","resolution":"/Users/nikos/WebstormProjects/svelte-fullstack-starter/functions/node_modules/firebase-admin/lib/index.js"}
[2020-05-09T19:44:16.134Z] [runtime-status] [31830] Resolved module firebase-functions {"declared":true,"installed":true,"version":"3.6.1","resolution":"/Users/nikos/WebstormProjects/svelte-fullstack-starter/functions/node_modules/firebase-functions/lib/index.js"}
[2020-05-09T19:44:16.134Z] [runtime-status] [31830] firebase-admin has been stubbed. {"adminResolution":{"declared":true,"installed":true,"version":"8.12.1","resolution":"/Users/nikos/WebstormProjects/svelte-fullstack-starter/functions/node_modules/firebase-admin/lib/index.js"}}
[2020-05-09T19:44:16.137Z] [runtime-status] [31830] initializeApp(DEFAULT) {"databaseURL":"https://svelte-fullstack-starter.firebaseio.com","storageBucket":"svelte-fullstack-starter.appspot.com","projectId":"svelte-fullstack-starter"}
✔ functions[listUsers]: http function initialized (http://localhost:5002/svelte-fullstack-starter/us-central1/listUsers).
✔ functions[upsertUsername]: http function initialized (http://localhost:5002/svelte-fullstack-starter/us-central1/upsertUsername).
✔ emulators: All emulators started, it is now safe to connect.
[2020-05-09T19:44:16.139Z] [worker-~diagnostic~-d5e3219e-99af-4c9f-85e3-90482760af04]: IDLE

```