ERROR: Step pas.plugins.ldap.setup has an invalid import handler

[skillfully]

I'm trying to install pas.plugin.ldap as dependency of a policy addon. The default profile is targeted and the log said that

2019-08-26 14:10:26 INFO Products.GenericSetup.tool Importing profile profile-pas.plugins.ldap.plonecontrolpanel:default with dependency strategy upgrade.
2019-08-26 14:10:26 INFO Products.GenericSetup.tool Applying profile profile-pas.plugins.ldap:default
2019-08-26 14:10:26 INFO GenericSetup.rolemap Role / permission map imported.
2019-08-26 14:10:26 ERROR GenericSetup Step pas.plugins.ldap.setup has an invalid import handler
2019-08-26 14:10:26 INFO Products.GenericSetup.tool Applying profile profile-yafowil.plone:default
2019-08-26 14:10:26 INFO GenericSetup.rolemap Role / permission map imported.
2019-08-26 14:10:26 ERROR GenericSetup Step pas.plugins.ldap.setup has an invalid import handler
2019-08-26 14:10:26 INFO Products.GenericSetup.tool Applying profile profile-pas.plugins.ldap.plonecontrolpanel:install-base
2019-08-26 14:10:26 INFO GenericSetup.rolemap Role / permission map imported.
2019-08-26 14:10:26 INFO GenericSetup.componentregistry Utilities registered.
2019-08-26 14:10:26 INFO GenericSetup.pas.plugins.ldap Imported ldap settings.
2019-08-26 14:10:26 ERROR GenericSetup Step pas.plugins.ldap.setup has an invalid import handler
2019-08-26 14:10:26 INFO Products.GenericSetup.tool Applying main profile profile-pas.plugins.ldap.plonecontrolpanel:default
2019-08-26 14:10:26 INFO GenericSetup.rolemap Role / permission map imported.
2019-08-26 14:10:26 INFO GenericSetup.controlpanel Control panel imported.
2019-08-26 14:10:26 ERROR GenericSetup Step pas.plugins.ldap.setup has an invalid import handler

I'm importing profile-pas.plugins.ldap.plonecontrolpanel:default in a preinstall handler of GenericSetup.
Can I ignore this logging output or is it a bug or something else?

Buildout for Plone v5.1.4 using versions

# Required by:
# node.ext.ldap==1.0b10
# pas.plugins.ldap==1.6.1
bda.cache = 1.3.0

# Required by:
# pas.plugins.ldap==1.6.1
node = 0.9.24

# Required by:
# pas.plugins.ldap==1.6.1
odict = 1.7.0

# Required by:
# hubub.plone.ubpolicy==1.0a1
pas.plugins.ldap = 1.6.1

# Required by:
# node.ext.ldap==1.0b10
passlib = 1.7.1

# Required by:
# hubub.plone.ubpolicy==1.0a1
plone.restapi = 4.3.1

# Required by:
# pas.plugins.ldap==1.6.1
python-ldap = 3.2.0

# Required by:
# bda.cache==1.3.0
python-memcached = 1.59

# Required by:
# pas.plugins.ldap==1.6.1
yafowil.widget.array = 1.6

# Required by:
# pas.plugins.ldap==1.6.1
yafowil.widget.dict = 1.7

# Required by:
# pas.plugins.ldap==1.6.1
yafowil.yaml = 1.3

and is running with this versions of Zope etc.

Plone 5.1.4 (5114)
CMF 2.2.12
Zope 2.13.27
Python 2.7.12 (default, Nov 12 2018, 14:36:49) [GCC 5.4.0 20160609]
PIL 5.2.0 (Pillow)