I try to run ngo-ui but Angular show error.

[kamitath]

I try to run ngo-ui on Part4.
I executed command 'npm start &' after that this error was shown.

Schema validation failed with the following errors: Data path ".builders['app-shell']" should have required property 'class'. Error: Schema validation failed with the following errors: Data path ".builders['app-shell']" should have required property 'class'. at MergeMapSubscriber.project (/home/ec2-user/non-profit-blockchain/ngo-ui/node_modules/@angular/cli/node_modules/@angular-devkit/core/src/workspace/workspace.js:215:42) at MergeMapSubscriber._tryNext (/home/ec2-user/non-profit-blockchain/ngo-ui/node_modules/@angular/cli/node_modules/rxjs/internal/operators/mergeMap.js:69:27) at MergeMapSubscriber._next (/home/ec2-user/non-profit-blockchain/ngo-ui/node_modules/@angular/cli/node_modules/rxjs/internal/operators/mergeMap.js:59:18) at MergeMapSubscriber.Subscriber.next (/home/ec2-user/non-profit-blockchain/ngo-ui/node_modules/@angular/cli/node_modules/rxjs/internal/Subscriber.js:67:18) at MergeMapSubscriber.notifyNext (/home/ec2-user/non-profit-blockchain/ngo-ui/node_modules/@angular/cli/node_modules/rxjs/internal/operators/mergeMap.js:92:26) at InnerSubscriber._next (/home/ec2-user/non-profit-blockchain/ngo-ui/node_modules/@angular/cli/node_modules/rxjs/internal/InnerSubscriber.js:28:21) at InnerSubscriber.Subscriber.next (/home/ec2-user/non-profit-blockchain/ngo-ui/node_modules/@angular/cli/node_modules/rxjs/internal/Subscriber.js:67:18) at MapSubscriber._next (/home/ec2-user/non-profit-blockchain/ngo-ui/node_modules/@angular/cli/node_modules/rxjs/internal/operators/map.js:55:26) at MapSubscriber.Subscriber.next (/home/ec2-user/non-profit-blockchain/ngo-ui/node_modules/@angular/cli/node_modules/rxjs/internal/Subscriber.js:67:18) at SwitchMapSubscriber.notifyNext (/home/ec2-user/non-profit-blockchain/ngo-ui/node_modules/@angular/cli/node_modules/rxjs/internal/operators/switchMap.js:86:26)

Is this Angular version problem ?
I appreciate if you help me.