[android-developers] how to change PathClassLoader path

hiii,
i am trying to customize an android app but on change on the package name, registration not took place. could any one help me.
 
logcat errors:
11-26 11:21:26.434: E/SIP SRV(24784): java.lang.NoClassDefFoundError: com.abc.utils.TimerWrapper

11-26 11:21:26.434: E/SIP SRV(24784):     at org.pjsip.pjsua.pjsuaJNI.create(Native Method)

11-26 11:21:26.434: E/SIP SRV(24784):     at org.pjsip.pjsua.pjsua.create(pjsua.java:62)

11-26 11:21:26.434: E/SIP SRV(24784):     at org.pjsip.pjsua.pjsua.create(pjsua.java:62)
11-26 11:21:26.434: E/SIP SRV(24784):     at com.myapp.service.SipService.startSipStack(SipService.java:1095)

11-26 11:21:26.434: E/SIP SRV(24784):     at com.myapp.service.SipService.access$12(SipService.java:1077)

11-26 11:21:26.434: E/SIP SRV(24784):     at com.myapp.service.SipService$StartRunnable.doRun(SipService.java:1623)

11-26 11:21:26.434: E/SIP SRV(24784):     at com.mobilesoftphone.service.SipService$SipRunnable.run(SipService.java:1697)

11-26 11:21:26.434: E/SIP SRV(24784):     at com.myapp.service.SipService$SipServiceExecutor.executeInternal(SipService.java:1610)

11-26 11:21:26.434: E/SIP SRV(24784):     at com.myapp.service.SipService$SipServiceExecutor.handleMessage(SipService.java:1602)

11-26 11:21:26.434: E/SIP SRV(24784):     at com.myapp.service.SipService$SipServiceExecutor.handleMessage(SipService.java:1602)

11-26 11:21:26.434: E/SIP SRV(24784):     at android.os.Looper.loop(Looper.java:143)

11-26 11:21:26.434: E/SIP SRV(24784):     at android.os.HandlerThread.run(HandlerThread.java:60)

11-26 11:21:26.434: E/SIP SRV(24784): Caused by: java.lang.ClassNotFoundException: com.abc.utils.TimerWrapper in loader dalvik.system.PathClassLoader[/data/app/com.myapp-1.apk]

11-26 11:21:26.434: E/SIP SRV(24784):     at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)

11-26 11:21:26.434: E/SIP SRV(24784):     at java.lang.ClassLoader.loadClass(ClassLoader.java:551)

11-26 11:21:26.434: E/SIP SRV(24784):     at java.lang.ClassLoader.loadClass(ClassLoader.java:511)


if i don't change the packeage name "com.abc.utils", there is no error, and TimerWraper.java class  is assesable. On changing the package name refrence is not automatically change.
if anyone can suggest the solution, Please let me know...

Thanks

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