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java.lang.NullPointerException: 	at java.io.File.(Unknown Source)	at com.install4j.runtime.installer.platform.win32.FolderInfo.getProgramFilesDirectory(Unknown Source)	at com.install4j.runtime.installer.helper.InstallerUtil.getStandardApplicationsDirectory(Unknown Source)	at com.install4j.runtime.installer.InstallerVariables.init(Unknown Source)	at com.install4j.runtime.installer.Installer.getScreenExecutor(Unknown Source)	at com.install4j.runtime.installer.Installer.main(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at com.exe4j.runtime.LauncherEngine.launch(Unknown Source)	at com.exe4j.runtime.WinLauncher.main(Unknown Source)