Error when configuring External Authentication

[Noriyuki TAKEI]

To use External Authentication in Shibboleth idp 5.0.0, we have configured
the following

idp.authn.flows = External

#### External ####

#idp.authn.External.order = 1000
#idp.authn.External.nonBrowserSupported = false
#idp.authn.External.matchExpression = false
# Unset if you plan to return full Java Subject from external source
#External.addDefaultPrincipals = true
# Servlet context-relative path to wherever your implementation lives
#External.external.externalAuthnPath = contextRelative:external.jsp
idp.authn.External.external.externalAuthnPath = contextRelative:Authn/Sam

However, I got the following error

2023-10-19 08:39:45.984:WARN :oejw.WebAppContext:main:. Failed startup of
context o.e.j.w.WebAppContext at b2c9a9c{Shibboleth Identity
Provider,/idp,[file:///opt/jetty-base/tmp/jetty-127_0_0_1-80-idp_war-_idp-any-15991808546894065198/webinf/,
jar:file:///opt/shibboleth-idp/war/idp.
war!/],UNAVAILABLE}{/opt/shibboleth-idp/war/idp.war}
BeanCreationException:. Error creating bean with name
'shibboleth.AuthenticationFlow$child#0' defined in class path resource
[net/shibboleth/idp/conf/authn-system.xml]:. Cannot resolve reference to
bean 'shibboleth.PrincipalServiceManager' while setting bean property
'principalServiceManager'

Is there any way to resolve this?
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