SequelizeConnectionError

[crazydev901]

service: ${env:SLS_SERVICE_NAME} # Name of the CloudFormation stack
functions: ${file(serverless/functions/index.js), ""}

frameworkVersion: ">=1.21.0 <2.0.0" # Serverless Framework version constraints

usagePlan: # Optional usage plan configuration
quota:
limit: 1000000
offset: 2
period: MONTH
throttle:
burstLimit: 200
rateLimit: 100

defaults:
stage: ${env:SLS_STAGE}
region: ${env:SLS_REGION}

provider:
name: aws
runtime: nodejs10.x
memorySize: 512
timeout: 18 # important
stage: ${env:SLS_STAGE}
region: ${env:SLS_REGION}
profile: ${env:SLS_PROFILE}

versionFunctions: false # dougmoscrop/serverless-plugin-split-stacks#15 (comment)

role: ${env:IAM_ROLE}
vpc:
securityGroupIds:
- ${env:SecurityGroupId}
subnetIds:
- ${env:SubnetId1}
- ${env:SubnetId2}
- ${env:SubnetId3}
- ${env:SubnetId4}
- ${env:SubnetId5}
- ${env:SubnetId6}
environment:
STAGE: ${env:SLS_STAGE}
NODE_ENV: ${env:NODE_ENV}
DB_DIALECT: ${env:DB_DIALECT}
DB_NAME: ${env:DB_NAME}
DB_USERNAME: ${env:DB_USERNAME}
DB_PASSWORD: ${env:DB_PASSWORD}
DB_HOST: ${env:DB_HOST}
DB_PORT: ${env:DB_PORT}

plugins:

• serverless-webpack
• serverless-plugin-split-stacks
• serverless-offline
• serverless-sequelize-migrations

package:
individually: true
excludeDevDependencies: true

custom:
splitStacks:
perFunction: false
perType: true
perGroupFunction: false
serverless-offline:
port: ${env:PROJECT_PORT}
migrationsPath: './migrations'
webpack:
packager: npm
webpackConfig: build/webpack.config.js # serverless-heaven/serverless-webpack#289
includeModules:
forceExclude:
- "aws-sdk"

This is my configuration.
When I run "sls migrations up", I get this error "SequelizeConnectionError: read ECONNRESET".
What's wrong with my script?