An error occurred: ServerLambdaFunction

Serverless Framework
1

Hi I am getting below error while deploying my code (sls deploy)

An error occurred: ServerLambdaFunction - AccessDeniedExceptionnull (Service: AWSLambdaInternal; Status Code: 403; Error Code: AccessDeniedException; Request ID: c1cc9b63-6314-40a8-8103-5151810f38ba; Proxy: null).

Below is my serverless.yml, Please help, I have been stuck on it for hours.

    service: coupon-serverless-demo

    functions:
      server:
        handler: server.run
        events:
          - http: ANY /
          - http: 'ANY {proxy+}'

    provider:
      name: aws
      runtime: nodejs12.x
      memorySize: 512 # set the maximum memory of the Lambdas in Megabytes
      timeout: 10 # the timeout is 10 seconds (default is 6 seconds)
      #stage: ${opt:stage, 'local'} # setting the env stage to dev, this will be visible in the routes
      #you can overwrite defaults here
      #Possible values are dev, stg, prd
      stage: ${opt:stage, 'dev'}
      region: ap-south-1

      #Define function environment variables here
      environment:
        STAGE: ${self:provider.stage}

    plugins:
      - serverless-offline