Error when executing invoke test

my sample invoke command: serverless invoke test --stage dev --region us-east-1 -f getPartners

after hitting enter:

Error:
TypeError: serverless.classes.Variables is not a constructor
at C:\Node JS Self Learnings\CICO boilerplate\node_modules\serverless-jest-plugin\lib\run-tests.js:13:18
at Promise._execute (C:\Node JS Self Learnings\CICO boilerplate\node_modules\bluebird\js\release\debuggability.js:384:9)
at Promise._resolveFromExecutor (C:\Node JS Self Learnings\CICO boilerplate\node_modules\bluebird\js\release\promise.js:518:18)
at new Promise (C:\Node JS Self Learnings\CICO boilerplate\node_modules\bluebird\js\release\promise.js:103:10)
at runTests (C:\Node JS Self Learnings\CICO boilerplate\node_modules\serverless-jest-plugin\lib\run-tests.js:8:3)
at ServerlessJestPlugin. (C:\Node JS Self Learnings\CICO boilerplate\node_modules\serverless-jest-plugin\index.js:97:23)
at ServerlessJestPlugin.tryCatcher (C:\Node JS Self Learnings\CICO boilerplate\node_modules\bluebird\js\release\util.js:16:23)
at Promise._settlePromiseFromHandler (C:\Node JS Self Learnings\CICO boilerplate\node_modules\bluebird\js\release\promise.js:547:31)
at Promise._settlePromise (C:\Node JS Self Learnings\CICO boilerplate\node_modules\bluebird\js\release\promise.js:604:18)
at Promise._settlePromiseCtx (C:\Node JS Self Learnings\CICO boilerplate\node_modules\bluebird\js\release\promise.js:641:10)
at _drainQueueStep (C:\Node JS Self Learnings\CICO boilerplate\node_modules\bluebird\js\release\async.js:97:12)
at _drainQueue (C:\Node JS Self Learnings\CICO boilerplate\node_modules\bluebird\js\release\async.js:86:9)
at Async._drainQueues (C:\Node JS Self Learnings\CICO boilerplate\node_modules\bluebird\js\release\async.js:102:5)
at Immediate.Async.drainQueues [as _onImmediate] (C:\Node JS Self Learnings\CICO boilerplate\node_modules\bluebird\js\release\async.js:15:14)
at processImmediate (node:internal/timers:466:21)