searchable plugin error - failed to rename index

I am getting the following error when starting up with the searchable plugin: Failed to rename index.  Does anyone know how to fix this?

org.codehaus.groovy.runtime.InvokerInvocationException: org.compass.core.engine.SearchEngineException: Failed to rename index [C:\WINDOWS\system32\config\systemprofile\.grails\projects\supplychain\searchable-index\production/index] to [C:\WINDOWS\system32\config\systemprofile\.grails\projects\supplychain\searchable-index\production\indexcopy0]