[Q] How to fix problem with emulator android

Hi, i want to start learning android programing, but if i enter "cmd" in android, i'm getting error message and then nothing...

C:\SDK\tools>android [INFO] Starting Android SDK and AVD Manager No command line parameters provided, launching UI. See 'android --help' for operations from the command line. java.lang.NullPointerException at com.android.sdklib.internal.avd.AvdManager.parseAvdInfo(AvdManager.ja va:1205) at com.android.sdklib.internal.avd.AvdManager.buildAvdList(AvdManager.ja va:1184) at com.android.sdklib.internal.avd.AvdManager.<init>(AvdManager.java:385 ) at com.android.sdkuilib.internal.repository.UpdaterData.initSdk(UpdaterD ata.java:238) at com.android.sdkuilib.internal.repository.UpdaterData.<init>(UpdaterDa ta.java:114) at com.android.sdkuilib.internal.repository.UpdaterWindowImpl.<init>(Upd aterWindowImpl.java:86) at com.android.sdkuilib.repository.UpdaterWindow.<init>(UpdaterWindow.ja va:42) at com.android.sdkmanager.Main.showMainWindow(Main.java:302) at com.android.sdkmanager.Main.doAction(Main.java:281) at com.android.sdkmanager.Main.run(Main.java:99) at com.android.sdkmanager.Main.main(Main.java:88)

please help

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