java.lang.AssertionError: SFS folder is null
   at org.netbeans.modules.php.project.classpath.CommonPhpSourcePath.getInternalFolders(CommonPhpSourcePath.java:78)
   at org.netbeans.modules.php.project.classpath.CommonPhpSourcePath.getInternalPath(CommonPhpSourcePath.java:66)
   at org.netbeans.modules.php.project.classpath.ClassPathProviderImpl.getBootClassPath(ClassPathProviderImpl.java:264)
   at org.netbeans.modules.php.project.classpath.ClassPathProviderImpl.getProjectClassPaths(ClassPathProviderImpl.java:304)
   at org.netbeans.modules.php.project.PhpProject$PhpOpenedHook.projectOpened(PhpProject.java:865)
   at org.netbeans.spi.project.ui.ProjectOpenedHook$1.projectOpened(ProjectOpenedHook.java:84)
   at org.netbeans.spi.project.ui.support.UILookupMergerSupport$OpenHookImpl.projectOpened(UILookupMergerSupport.java:200)
   at org.netbeans.spi.project.ui.ProjectOpenedHook$1.projectOpened(ProjectOpenedHook.java:84)
   at org.netbeans.modules.project.ui.OpenProjectList.notifyOpened(OpenProjectList.java:1138)
   at org.netbeans.modules.project.ui.OpenProjectList.doOpenProject(OpenProjectList.java:1219)
   at org.netbeans.modules.project.ui.OpenProjectList.open(OpenProjectList.java:716)
   at org.netbeans.modules.project.ui.OpenProjectList$4.run(OpenProjectList.java:584)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1452)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2032)