Error Android. widget. imagebutton cannot be cast to Android. widget. Button

An exception occurred when you click the app icon to display the session List.

07-06 10:40:46. 015: E/androidruntime (10057): Fatal exception: Main
10:40:46 07-06. 015: E/androidruntime (10057): Java. lang. runtimeexception: unable to start activity componentinfo {COM. txrj. SMS/COM. txrj. SMS. activity. conversationlistactivity}: Java. lang. classcastexception: Android. widget. imagebutton cannot be cast to Android. widget. button

07-06 10:40:46. 015: E/androidruntime (10057): at Android. App. activitythread. initialize mlaunchactivity (activitythread. Java: 1970)

07-06 10:40:46. 015: E/androidruntime (10057): at Android. App. activitythread. handlelaunchactivity (activitythread. Java: 1995)

07-06 10:40:46. 015: E/androidruntime (10057): at Android. App. activitythread. Access $600 (activitythread. Java: 128)

07-06 10:40:46. 015: E/androidruntime (10057): at Android. App. activitythread $ H. handlemessage (activitythread. Java: 1161)

07-06 10:40:46. 015: E/androidruntime (10057): at Android. OS. handler. dispatchmessage (handler. Java: 99)

07-06 10:40:46. 015: E/androidruntime (10057): at Android. OS. Looper. Loop (Looper. Java: 137)

07-06 10:40:46. 015: E/androidruntime (10057): at Android. App. activitythread. Main (activitythread. Java: 4517)

Mcreatemsgbtn = (button) findviewbyid (R. Id. create_message );

Change (button) to (imagebutton)