Serverless Offline - Attempt to invoke function 'xxx' failed. Function does not exists

Question

Hello :) Hope to find you well.

I am trying to set test my serverless environment locally via the serverless-offline node package.

Here is my serverless.yml file:

org: etisreal11
app: leaderboards-api
service: leaderboards-api
provider:
 name: aws
 runtime: nodejs18.x
 stage: STG
 profile: local
 region: eu-central-1
 environment:
 TABLE_NAME: ${self:custom.TABLE_NAME}
 DYNAMODB_HOSTNAME: localhost
 AWS_ACCESS_KEY: Local
 AWS_SECRET_KEY: Local
 logs:
 httpApi: true
custom:
 serverless-offline:
 noPrependStageInUrl: true
 resourceRoutes: true # HTTP Proxy
 TABLE_NAME: ${self:provider.stage}_Leaderboards
plugins:
 - serverless-dynamodb-local
 - serverless-offline
 - serverless-offline-lambda
package:
 individually: true
functions:
 adminHandler:
 handler: adminHandler/leaderboardsAdminHandler.handler
 environment:
 TABLE_NAME: ${self:custom.TABLE_NAME}
 DYNAMODB_HOSTNAME: ${self:provider.environment.DYNAMODB_HOSTNAME}
 events:
 - http:
 path: /
 method: ANY
 - http:
 path: '{proxy+}'
 method: ANY
resources:
 Resources:
 STGLeaderboards:
 Type: AWS::DynamoDB::Table
 Properties:
 TABLE_NAME: ${self:custom.TABLE_NAME}
 AttributeDefinitions:
 - AttributeName: PK
 AttributeType: S
 - AttributeName: SK
 AttributeType: S
 KeySchema:
 - AttributeName: PK
 KeyType: HASH
 - AttributeName: SK
 KeyType: HASH
 BillingMode: PAY_PER_REQUEST

This is the file I am referencing:

export const handler = async (event) => {
 switch (event.routeKey) {
 case 'POST /admin/leaderboard':
 try {
 const validatedResponse = returnCreateLeaderboardReq(JSON.parse(event.body))
 // Invalid payload
 if (validatedResponse?.statusCode === 422) return JSON.stringify(validatedResponse)
 
 const createdLeadRes = await documentClient.send(new PutCommand(validatedResponse))
 
 return JSON.stringify({
 statusCode: 201,
 body: { message: createdLeadRes }
 })
 } catch (error) {

 ...

and this is the output of the tree command: tree -L 2

.
├── adminHandler
│  └── leaderboardsAdminHandler.js
├── convert-to-base64.js
├── create-dynamodbtable.md
├── docker
│  └── dynamodb
├── docker-compose.yaml
├── index.js
├── leaderboardsStreamHandler
│  ├── deleteHandler.js
│  ├── deleteHandler.test.js
│  ├── insertHandler.js
│  ├── insertHandler.test.js
│  ├── leaderboardsStreamHandler.js
│  ├── leaderboardsStreamHandler.test.js
│  ├── utils.js
│  └── utils.test.js
├── mock-data
│  ├── encoded-lighter-create
│  ├── encoded-lighter-remove
│  ├── encoded-single-tournament
│  ├── participants.json
│  ├── single-tournament.json
│  ├── single-tournament.zip
│  ├── tournaments.json
│  ├── tournaments-lighter.json
│  ├── tournaments-lighter-remove.json
│  ├── tournaments-lighter-remove.zip
│  ├── tournaments-lighter.zip
│  ├── tournaments-light.json
│  ├── tournaments-light.zip
│  └── tournaments.zip
├── node_modules
|
├── offline
│  └── migrations
├── OLD-leaderboardsStreamHandler
│  ├── insertHandler.js
│  ├── leaderboardsStreamHandler.js
│  ├── modifyHandler.js
│  └── NOTES.md
├── package.json
├── package-lock.json
├── README.md
├── serverless.yml
└── vitest.config.ts

Everything starts up correctly:

Starting Offline at stage STG (eu-central-1)
Offline Lambda Server listening on http://localhost:4000
Offline [http for lambda] listening on http://localhost:3002
Function names exposed for local invocation by aws-sdk:
 * adminHandler: leaderboards-api-STG-adminHandler
 ┌────────────────────────────────────────────────────────────────────────────────┐
 │ │
 │ ANY | http://localhost:3000/ │
 │ POST | http://localhost:3000/2015-03-31/functions/adminHandler/invocations │
 │ ANY | http://localhost:3000/{proxy*} │
 │ POST | http://localhost:3000/2015-03-31/functions/adminHandler/invocations │
 │ │
 └────────────────────────────────────────────────────────────────────────────────┘
Server ready: http://localhost:3000 🚀

however, if I try to get any of the endpoints above (or any other) I get this error:

✖ Attempt to invoke function 'adminHandler' failed. Function does not exists.

I've looked into these questions:

"Serverless-offline: route not found." running an AWS Lambda function in offline mode

Serverless Offline: Error while running handler, cannot find module

but I wasn't able to solve it after far too many hours. Honestly, I have no clue of what is going on. I wish I could provide more insight :/

If you have any suggestion of tip, it would be very much appreciated...

Thanks in advance

• Robin Thomas: Can you remove serverless-offline-lambda plugin and check?
• ETisREAL: OMG that actually fixed it! Why though? Aren't you supposed to use the plugin in order to make the setup work? :/

Answer 1

Remove the serverless-offline-lambda serverless plugin from serverless.yml file:

plugins:
 - serverless-dynamodb-local
 - serverless-offline
 - serverless-offline-lambda

For one, you just need serverless-offline plugin to run lambda in your local now.

Second, serverless-offline-lambda plugin was last updated over 4 years back. Both serverless and serverless-offline had changed a lot within these years.

• ETisREAL: Removing the serverless-offline-lambda plugin did it. Thank you very, very much @Robin