'ngx-build-plus' could not be found in workspace

I am having below error in Prod build. Can someone suggest how to fix this error?

Project 'ngx-build-plus' could not be found in workspace.

Error: Project 'ngx-build-plus' could not be found in workspace.

myboard-app@0.1.0 ng /home/vsts/work/1/s at Workspace.getProject (/home/vsts/work/1/s/node_modules/@angular-devkit/core/src/workspace/workspace.js:93:19) at Architect.getBuilderConfiguration (/home/vsts/work/1/s/node_modules/@angular-devkit/architect/src/architect-legacy.js:117:41) at RunCommand.runSingleTarget (/home/vsts/work/1/s/node_modules/@angular/cli/models/architect-command.js:160:45) ng "run" "ngx-build-plus:build" angular.json
​

"architect": {
"build": {
"builder": "ngx-build-plus:build",
.. ..
}

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