Deploy Failed Due to error Value of property Variables must be an object with String (or simple type) properties - node.js

Question

I am getting a serverless error as follow:
An error occurred: CandidateSubmissionLambdaFunction - Value of property Variables must be an object with String (or simple type) properties.
I have tried changing the value to string from a yml file then also I am getting the same error.
My Yml file code is as below:
frameworkVersion: ">=1.1.0 <2.0.0"
provider:
name: aws
runtime: nodejs8.10
stage: dev
region: us-east-1
environment:
CANDIDATE_TABLE: ${self:service}-${opt:stage, self:provider.stage}
CANDIDATE_EMAIL_TABLE: "candidate-email-${opt:stage, self:provider.stage}"
iamRoleStatements:
- Effect: Allow
Action:
- dynamodb:Query
- dynamodb:Scan
- dynamodb:GetItem
- dynamodb:PutItem
Resource: "*"
resources:
Resources:
CandidatesDynamoDbTable:
Type: 'AWS::DynamoDB::Table'
DeletionPolicy: Retain
Properties:
AttributeDefinitions:
-
AttributeName: "id"
AttributeType: "S"
KeySchema:
-
AttributeName: "id"
KeyType: "HASH"
ProvisionedThroughput:
ReadCapacityUnits: 1
WriteCapacityUnits: 1
StreamSpecification:
StreamViewType: "NEW_AND_OLD_IMAGES"
TableName: ${self:provider.environment.CANDIDATE_TABLE}
functions:
candidateSubmission:
handler: api/candidate.submit
memorySize: 128
description: Submit candidate information and starts interview process.
events:
- http:
path: candidates
method: post
Environment Information
OS: linux
Node Version: 8.10.0
Serverless Version: 1.27.3
I want to deploy this on aws and want to perform curd operation.

Answer 1

One of the variables used for value in your YAML configuration might be the wrong type.
${self:service} isn't defined in the YAML but is being referenced in
provider:
environment:
CANDIDATE_TABLE: ${self:service}-${opt:stage, self:provider.stage}