BadRequest: The id "intranet" is reserved

[sif77]

plone 4.3.9
Products.CMFPlacefulWorkflow 1.5.13

When i try to activate Products.CMFPlacefulWorkflow, i got the following error :

Traceback (innermost last):

Module ZPublisher.Publish, line 138, in publish
Module ZPublisher.mapply, line 77, in mapply
Module ZPublisher.Publish, line 48, in call_object
Module Products.CMFQuickInstallerTool.QuickInstallerTool, line 686, in installProducts
Module Products.CMFQuickInstallerTool.QuickInstallerTool, line 603, in installProduct
__traceback_info__: ('CMFPlacefulWorkflow',)
Module Products.GenericSetup.tool, line 379, in runAllImportStepsFromProfile
__traceback_info__: profile-Products.CMFPlacefulWorkflow:CMFPlacefulWorkflow
Module Products.GenericSetup.tool, line 1414, in _runImportStepsFromContext
Module Products.GenericSetup.tool, line 1226, in _doRunImportStep
__traceback_info__: placeful_workflow
Module Products.CMFPlacefulWorkflow.exportimport.workflow_policies, line 143, in importWorkflowPolicies
Module Products.GenericSetup.utils, line 849, in importObjects
__traceback_info__: portal_placeful_workflow
Module Products.GenericSetup.utils, line 512, in _importBody
Module Products.GenericSetup.OFSP.exportimport, line 54, in _importNode
Module Products.GenericSetup.utils, line 571, in _initObjects
__traceback_info__: ('intranet', 'WorkflowPolicy')
Module OFS.ObjectManager, line 326, in _setObject
Module OFS.ObjectManager, line 120, in checkValidId

BadRequest: The id "intranet" is reserved.

(Plone instance id is intranet)