Crash on android 4.4

[thalman]

Stack trace:

Exception java.lang.IllegalArgumentException:
  at android.media.AudioRecord.<init> (AudioRecord.java:233)
  at net.halman.playrecorder.Frequency.<init> (Frequency.java:67)
  at net.halman.playrecorder.MainActivity.onListen (MainActivity.java:644)
  at net.halman.playrecorder.MainActivity.onGripViewListen (MainActivity.java:792)
  at net.halman.playrecorder.GripView.onClick (GripView.java:159)
  at net.halman.playrecorder.MainActivity$4.onClick (MainActivity.java:110)
  at android.view.View.performClick (View.java:4463)
  at android.view.View$PerformClick.run (View.java:18770)
  at android.os.Handler.handleCallback (Handler.java:808)
  at android.os.Handler.dispatchMessage (Handler.java:103)
  at android.os.Looper.loop (Looper.java:193)
  at android.app.ActivityThread.main (ActivityThread.java:5292)
  at java.lang.reflect.Method.invokeNative
  at java.lang.reflect.Method.invoke (Method.java:515)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:824)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:640)
  at dalvik.system.NativeStart.main