java.lang.NullPointerException: null
at biz.netcentric.cq.tools.actool.installationhistory.impl.AcHistoryServiceImpl.persistInstalledConfigurations(AcHistoryServiceImpl.java:163)
at biz.netcentric.cq.tools.actool.installationhistory.impl.AcHistoryServiceImpl.persistHistory(AcHistoryServiceImpl.java:81)
at biz.netcentric.cq.tools.actool.aceservice.impl.AceServiceImpl.installConfigurationFiles(AceServiceImpl.java:394)
at biz.netcentric.cq.tools.actool.aceservice.impl.AceServiceImpl.execute(AceServiceImpl.java:317)
Exception: