run release 6.6.0 src code , flowable-ui-app start error

Env:

Win 10
Java 8
flowable-engine-flowable-6.6.0 code project

Steps
add flowable-ui pom.xml in ide maven
run flowable-ui-app FlowableUiApplication main

Error Info:
***************************
APPLICATION FAILED TO START
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Description:

Parameter 0 of method idmIdentityService in org.flowable.spring.boot.idm.IdmEngineServicesAutoConfiguration required a bean of type 'org.flowable.idm.engine.IdmEngine' that could not be found.

The injection point has the following annotations:
- @org.springframework.beans.factory.annotation.Autowired(required=true)

The following candidates were found but could not be injected:
- Bean method 'idmEngine' in 'IdmEngineServicesAutoConfiguration.AlreadyInitializedAppEngineConfiguration' not loaded because @ConditionalOnBean (types: org.flowable.app.engine.AppEngine; SearchStrategy: all) did not find any beans of type org.flowable.app.engine.AppEngine
- Bean method 'idmEngine' in 'IdmEngineServicesAutoConfiguration.AlreadyInitializedEngineConfiguration' not loaded because @ConditionalOnBean (types: org.flowable.engine.ProcessEngine; SearchStrategy: all) did not find any beans of type org.flowable.engine.ProcessEngine

Action:

Consider revisiting the entries above or defining a bean of type 'org.flowable.idm.engine.IdmEngine' in your configuration.