authn/Duo flow failure

[Rory Larson]

Hello,

Trying to upgrade to 3.3.1, with a prior Duo installation, I'm getting an error on the construction of the flow 'authn/Duo'.  The idp-process.log file gives the following.  There seem to be no preceding errors.

2017-04-03 15:00:16,672 - DEBUG [net.shibboleth.idp.profile.spring.factory.FlowDefinitionRegistryFactoryBean:240] - Registered flow ID 'authn/conditions/expiring-password' using 'file [/opt/shibboleth-idp/flows/authn/conditions/expiring-password/expiring-password-flow.xml]'
2017-04-03 15:00:16,672 - DEBUG [net.shibboleth.idp.profile.spring.factory.FlowDefinitionRegistryFactoryBean:240] - Registered flow ID 'c14n/Duo' using 'file [/opt/shibboleth-idp/flows/c14n/Duo/duo-c14n-flow.xml]'
2017-04-03 15:00:16,672 - DEBUG [net.shibboleth.idp.profile.spring.factory.FlowDefinitionRegistryFactoryBean:240] - Registered flow ID 'user/prefs' using 'file [/opt/shibboleth-idp/flows/user/prefs/prefs-flow.xml]'
2017-04-03 15:00:16,737 - WARN [net.shibboleth.ext.spring.context.DeferPlaceholderFileSystemXmlWebApplicationContext:549] - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'config': Invocation of init method failed; nested exception is org.springframework.webflow.definition.registry.FlowDefinitionConstructionException: An exception occurred constructing the flow 'authn/Duo'
2017-04-03 15:00:16,746 - ERROR [org.springframework.web.servlet.DispatcherServlet:502] - Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'config': Invocation of init method failed; nested exception is org.springframework.webflow.definition.registry.FlowDefinitionConstructionException: An exception occurred constructing the flow 'authn/Duo'
        at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:136)
Caused by: org.springframework.webflow.definition.registry.FlowDefinitionConstructionException: An exception occurred constructing the flow 'authn/Duo'
        at org.springframework.webflow.engine.builder.DefaultFlowHolder.assembleFlow(DefaultFlowHolder.java:111)
Caused by: org.springframework.webflow.engine.builder.FlowBuilderException: Unable to get the model for this flow
        at org.springframework.webflow.engine.builder.model.FlowModelFlowBuilder.doInit(FlowModelFlowBuilder.java:154)
Caused by: org.springframework.webflow.engine.model.builder.FlowModelBuilderException: Unable to find flow 'authn.abstract' to inherit from
        at org.springframework.webflow.engine.model.builder.xml.XmlFlowModelBuilder.mergeFlows(XmlFlowModelBuilder.java:646)
Caused by: org.springframework.webflow.engine.model.registry.NoSuchFlowModelException: No flow model 'authn.abstract' found
        at org.springframework.webflow.engine.model.registry.FlowModelRegistryImpl.getLocalFlowModelHolder(FlowModelRegistryImpl.java:94)

Any thoughts on where to look from here?

Thanks,
Rory

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