Error by Converting IvyAddOns

Hello,

I use the new Axon Designer Version: 6.5.0 (Jakobshorn). On starting with a new Workspace i want Import the project IvyAddOns. I Imported it from the applications\utilities on the Desinger Installdirectory. After unpacking the Project an Errormessige shows that the Project needs to convert.

"Project has wrong version and needs to be converted. Actual version is 51,917, required version is 63,000."

I used the option "Convert Project" but it runs in an Error:

Converting . Log is stored in 'logs/conversion51917-63000.log'

Add REST client configuration to the project.

Unexpected error when converting project 'IvyAddOns'.
ch.ivyteam.ivy.resource.datamodel.ResourceDataModelException: File restClients.restConfig already exists
    at ch.ivyteam.ivy.resource.datamodel.framework.AbstractProjectResourceDataModel.createNewDataModelFor(AbstractProjectResourceDataModel.java:121)
    at ch.ivyteam.ivy.rest.client.config.internal.ProjectRestClientsManager.initialize(ProjectRestClientsManager.java:70)
    at ch.ivyteam.ivy.designer.project.internal.convert.tasks.v70.CreateRestClientConfigurationFile.doConvertProject(CreateRestClientConfigurationFile.java:41)
    at ch.ivyteam.ivy.designer.project.restricted.convert.AbstractIvyProjectConverterTask.convertProject(AbstractIvyProjectConverterTask.java:96)
    at ch.ivyteam.ivy.designer.project.restricted.convert.IvyProjectConverter$1.run(IvyProjectConverter.java:305)
    at ch.ivyteam.eclipse.util.WorkspaceRunnable$1.run(WorkspaceRunnable.java:70)
    at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2313)
    at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2295)
    at ch.ivyteam.eclipse.util.WorkspaceRunnable.execute(WorkspaceRunnable.java:87)
    at ch.ivyteam.ivy.designer.project.restricted.convert.IvyProjectConverter.convertProject(IvyProjectConverter.java:328)
    at ch.ivyteam.ivy.designer.project.restricted.convert.IvyProjectConverter$2.run(IvyProjectConverter.java:498)
    at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:122)

Thank you for HELP Ralf