New error when removing password from lock screen

[Jefferson W]

I can't remove the password from the lock screen.this is the error log:
java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:353)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383)
at java.util.concurrent.FutureTask.setException(FutureTask.java:252)
at java.util.concurrent.FutureTask.run(FutureTask.java:271)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
at java.lang.Thread.run(Thread.java:764)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int com.android.internal.widget.VerifyCredentialResponse.getResponseCode()' on a null object reference
at android.os.Parcel.readException(Parcel.java:2019)
at android.os.Parcel.readException(Parcel.java:1959)
at com.android.internal.widget.ILockSettings$Stub$Proxy.checkCredential(ILockSettings.java:642)
at com.android.internal.widget.LockPatternUtils.checkCredential(LockPatternUtils.java:374)
at com.android.internal.widget.LockPatternUtils.checkPassword(LockPatternUtils.java:501)
at com.android.internal.widget.LockPatternUtils.checkPassword(LockPatternUtils.java:488)
at com.android.settings.fm.doInBackground(LockPatternChecker.java:263)
at com.android.settings.fm.doInBackground(LockPatternChecker.java:260)
at android.os.AsyncTask$2.call(AsyncTask.java:333)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
... 3 more