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java.lang.IllegalThreadStateException: Thread already started	at java.lang.Thread.checkNotStarted(Thread.java:849)	at java.lang.Thread.start(Thread.java:1059)	at com.company.app.CheckRoosterWijziging$SayHello$1.run(CheckRoosterWijziging.java:94)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:135)	at android.app.ActivityThread.main(ActivityThread.java:5254)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)