Android Java Emulator . . WARNING: Data partition already in use. Changes will not persist

Question

I am trying to run an Android project in Eclipse(Android 2.3.3, on a Windows 7 64-bit machine), but I run in to the following error (on console window). This worked a couple of hours ago but now does not and I don't think I changed anything major. Would appreciate any help I can to fix this issue please

[2012-09-02 17:38:33 - mapviewballoons.Main] Starting incremental Pre Compiler: Checking resource changes.
[2012-09-02 17:38:33 - mapviewballoons.Main] Nothing to pre compile!
[2012-09-02 17:38:33 - samplemap] Refreshing resource folders.
[2012-09-02 17:38:35 - Emulator] WARNING: Data partition already in use. Changes will not persist!
[2012-09-02 17:38:35 - Emulator] WARNING: SD Card image already in use: C:\Users\MACHINEOVA\.android\avd\MAPAPP1.avd/sdcard.img
[2012-09-02 17:38:35 - Emulator] WARNING: Cache partition already in use. Changes will not persist!

Answer 1

Same problem also i have faced.

I deleted My emulator and create a new emulator.

It's working fine for me.

Answer 2

If none of the previous answers have worked try navigating to the folder mentioned in the error message (in your case C:\Users\MACHINEOVA.android\avd\MAPAPP1.avd/) and (on Windows) there will be several folders whose names end in .lock, delete those and restart your emulator.