@wdio/local-runner: Failed launching test session: TypeError: ReporterClass is not a constructor

Environment (please complete the following information):

• **WebdriverIO version:**6.13.4

• Mode: Standalone

• Node.js version: 10.19.0

• NPM version: 6.13.4

• Browser name and version: Chrome 78

• Platform name and version: Fedora

• Additional wdio packages used (if applicable):

"devDependencies": {
    "@wdio/allure-reporter": "^5.18.6",
    "@wdio/browserstack-service": "^5.18.7",
    "wdio-browserstack-reporter": "~0.1.1",
    "@wdio/cli": "^5.18.7",
    "@wdio/dot-reporter": "^5.18.6",
    "@wdio/local-runner": "^6.0.5",
    "@wdio/mocha-framework": "^5.18.7",
    "@wdio/selenium-standalone-service": "^5.16.10",
    "@wdio/spec-reporter": "^5.18.7",
    "@wdio/sync": "^5.18.7",
    "chai": "^3.5.0",
    "chromedriver": "^75.1.0",
    "mocha": "^6.2.2",
    "wdio-chromedriver-service": "^5.0.2",
    "wdio-docker-service": "^2.3.0",
    "protractor-browserstack-reporter": "~0.1.1"
  },

Config of WebdriverIO

exports.config = {
    runner: 'local',
    specs: [
      // specs files
    ],
    reporters: ['browserstack'],
    reporterOptions: {
        browserstack: {
            outputDir: './'
        }
    }, 
     services: ['browserstack'],
    user: '*******',
    key: '******',
    capabilities: [
        {
        'os': 'Windows',
        'os_version': '10',
        'browser': 'Chrome',
        'browser_version': '79',
        'acceptSslCerts': 'true',
        'browserstack.local': 'true',
        'browserstack.debug':'true',
        'browserstack.networkLogs':'true',
        'resolution' : '1920x1080'
      },
     {
        'os': 'Windows',
        'os_version': '10',
        'browser': 'Firefox',
        'browser_version': '70',
        'acceptSslCerts': 'true',
        'browserstack.local': 'true',
        'browserstack.debug':'true',
        'resolution' : '1920x1080'
      }
 ],
      maxInstances: 1,
      'browserstack.local':'true',
}

Describe the bug Running test as per the script provided giving an error in wdio-local-runner. I have updated the version of the reporter as well to 6.0.0, still getting the same error while running the test.

This seems to be a similar issue as:https://github.com/sullenor/wdio-teamcity-reporter/issues/12

To Reproduce Add ‘Browserstack reporter’ in conf file and try running test.

Expected behavior Should run test without error in Reporter class

Log

[0-3] 2020-04-07T05:01:21.189Z ERROR @wdio/local-runner: Failed launching test session: TypeError: ReporterClass is not a constructor
    at BaseReporter.initReporter (/home/apaliwal/Solution-engine-test/solution-engine-test-ui/node_modules/@wdio/runner/build/reporter.js:124:14)
    at Array.map (<anonymous>)
    at new BaseReporter (/home/apaliwal/Solution-engine-test/solution-engine-test-ui/node_modules/@wdio/runner/build/reporter.js:32:39)
    at Runner.run (/home/apaliwal/Solution-engine-test/solution-engine-test-ui/node_modules/@wdio/runner/build/index.js:77:21)
    at process.on.m (/home/apaliwal/Solution-engine-test/solution-engine-test-ui/node_modules/@wdio/local-runner/build/run.js:37:20)
    at process.emit (events.js:203:15)
    at process.EventEmitter.emit (domain.js:448:20)
    at emit (internal/child_process.js:832:12)
    at process._tickCallback (internal/process/next_tick.js:63:19)