Exception message system error

When I open matlab this pops up and I cannot open any of my code files. I don't know how to fix it.

Caught "std::exception" Exception message is:
fl:filesystem:SystemError
Exception in thread "ContributedToolsLoader" java.lang.NoClassDefFoundError: Could not initialize class java.nio.file.FileSystems$DefaultFileSystemHolder
	at java.nio.file.FileSystems.getDefault(FileSystems.java:176)
	at java.nio.file.Paths.get(Paths.java:84)
	at com.mathworks.addons_common.util.FolderNameUtils.getFirstFolderInUserPath(FolderNameUtils.java:63)
	at com.mathworks.addons_common.util.FolderNameUtils.getUsersHomeDirectory(FolderNameUtils.java:35)
	at com.mathworks.addons_common.util.settings.InstallLocation.getDefaultInstallationFolder(InstallLocation.java:131)
	at com.mathworks.addons_common.util.settings.InstallLocation.getCurrentInstallLocation(InstallLocation.java:112)
	at com.mathworks.addons_common.util.settings.InstallationFolderUtils.getInstallationFolder(InstallationFolderUtils.java:34)
	at com.mathworks.appmanagement.AppManagementApiImpl.getMyAppsLocation(AppManagementApiImpl.java:359)
	at com.mathworks.appmanagement.AppManagementApiImpl.getInstalledAppsMap(AppManagementApiImpl.java:364)
	at com.mathworks.appmanagement.AppManagementApiImpl.getInstalledApps(AppManagementApiImpl.java:257)
	at com.mathworks.appmanagement.AppManagementApiImpl.getEnabledApps(AppManagementApiImpl.java:213)
	at com.mathworks.appmanagement.AppManagementApiImpl.loadInstalledApps(AppManagementApiImpl.java:79)
	at com.mathworks.mde.desk.ContributedTools.<init>(ContributedTools.java:84)
	at com.mathworks.mde.desk.ContributedToolsLoader$3.run(ContributedToolsLoader.java:68)
	at java.lang.Thread.run(Thread.java:748)

[Enas S.]

how you solved the problem?