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libcore.io.ErrnoException: fcntl failed: EAGAIN (Try again)	at libcore.io.Posix.fcntlFlock(Native Method)	at libcore.io.ForwardingOs.fcntlFlock(ForwardingOs.java:54)	at java.nio.FileChannelImpl.basicLock(FileChannelImpl.java:121)	at java.nio.FileChannelImpl.tryLock(FileChannelImpl.java:177)	at java.nio.channels.FileChannel.tryLock(FileChannel.java:587)	at org.bitcoinj.store.SPVBlockStore.(SPVBlockStore.java:111)	at de.schildbach.wallet.service.BlockchainServiceImpl.onCreate(BlockchainServiceImpl.java:611)	at android.app.ActivityThread.handleCreateService(ActivityThread.java:2558)	at android.app.ActivityThread.access$1800(ActivityThread.java:135)	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)	at android.os.Handler.dispatchMessage(Handler.java:102)	at android.os.Looper.loop(Looper.java:136)	at android.app.ActivityThread.main(ActivityThread.java:5001)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:515)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)	at dalvik.system.NativeStart.main(Native Method)