[android-developers] Error when switch activity at the second time

Hi, i am developing an android application and i need help to solve my
problem on my application.
My application is consist of 2 activity, main.java and
CobaGesture.java.

Main,java has a start button that run startActivity(new
Intent(main.this, CobaGesture.class));
CobaGesture.java has a back button that run finish();
startActivity(new Intent(CobaGesture.this, main.class));

When the app running, i press the start button the activity changed to
CobaGesture, and when i press back button in CobaGesture the activity
back to main. But, when i press start again the app is forced close
and here's logcat of the error:


//when i press the start button for the second time
06-01 14:59:51.836: INFO/InputDispatcher(65): Application is not
responding: Window{4079d900 coba.gesture/coba.gesture.main
paused=false}. 5006.2ms since event, 5005.3ms since wait started
06-01 14:59:51.836: INFO/WindowManager(65): Input event dispatching
timed out sending to coba.gesture/coba.gesture.main
06-01 14:59:51.926: INFO/Process(65): Sending signal. PID: 2730 SIG: 3
06-01 14:59:51.926: INFO/dalvikvm(2730): threadid=4: reacting to
signal 3
06-01 14:59:51.957: WARN/ActivityManager(65): Activity destroy timeout
for HistoryRecord{4068bea0 coba.gesture/.CobaGesture}
06-01 14:59:51.996: INFO/dalvikvm(2730): Wrote stack traces to '/data/
anr/traces.txt'
06-01 14:59:52.025: INFO/Process(65): Sending signal. PID: 65 SIG: 3
06-01 14:59:52.025: INFO/dalvikvm(65): threadid=4: reacting to signal
3
06-01 14:59:52.435: INFO/dalvikvm(65): Wrote stack traces to '/data/
anr/traces.txt'
06-01 14:59:52.435: INFO/Process(65): Sending signal. PID: 122 SIG: 3
06-01 14:59:52.435: INFO/dalvikvm(122): threadid=4: reacting to signal
3
06-01 14:59:52.556: INFO/dalvikvm(122): Wrote stack traces to '/data/
anr/traces.txt'
06-01 14:59:52.576: DEBUG/dalvikvm(65): GC_CONCURRENT freed 993K, 47%
free 4456K/8327K, external 2036K/2548K, paused 13ms+31ms
06-01 14:59:52.605: INFO/Process(65): Sending signal. PID: 125 SIG: 3
06-01 14:59:52.605: INFO/dalvikvm(125): threadid=4: reacting to signal
3
06-01 14:59:52.656: INFO/dalvikvm(125): Wrote stack traces to '/data/
anr/traces.txt'
06-01 14:59:53.676: DEBUG/dalvikvm(65): GC_EXPLICIT freed 231K, 46%
free 4535K/8327K, external 2036K/2548K, paused 257ms

//error log
06-01 14:59:54.406: ERROR/ActivityManager(65): ANR in coba.gesture
(coba.gesture/.main)
06-01 14:59:54.406: ERROR/ActivityManager(65): Reason:
keyDispatchingTimedOut
06-01 14:59:54.406: ERROR/ActivityManager(65): Load: 0.62 / 0.35 /
0.46
06-01 14:59:54.406: ERROR/ActivityManager(65): CPU usage from 8027ms
to -2ms ago:
06-01 14:59:54.406: ERROR/ActivityManager(65): 85% 2730/
coba.gesture: 78% user + 6.6% kernel / faults: 27 minor
06-01 14:59:54.406: ERROR/ActivityManager(65): 13% 65/system_server:
5.9% user + 7.2% kernel / faults: 1 minor 1 major
06-01 14:59:54.406: ERROR/ActivityManager(65): 0.2% 41/adbd: 0% user
+ 0.2% kernel / faults: 13 minor
06-01 14:59:54.406: ERROR/ActivityManager(65): 100% TOTAL: 84% user +
15% kernel
06-01 14:59:54.406: ERROR/ActivityManager(65): CPU usage from 1849ms
to 2454ms later:
06-01 14:59:54.406: ERROR/ActivityManager(65): 72% 2730/
coba.gesture: 69% user + 3.3% kernel / faults: 4 minor
06-01 14:59:54.406: ERROR/ActivityManager(65): 72% 2826/Thread-10:
69% user + 3.3% kernel
06-01 14:59:54.406: ERROR/ActivityManager(65): 1.6% 2735/Compiler:
0% user + 1.6% kernel
06-01 14:59:54.406: ERROR/ActivityManager(65): 25% 65/system_server:
8.6% user + 17% kernel
06-01 14:59:54.406: ERROR/ActivityManager(65): 13% 99/
InputDispatcher: 6.8% user + 6.8% kernel
06-01 14:59:54.406: ERROR/ActivityManager(65): 10% 76/
SurfaceFlinger: 1.7% user + 8.6% kernel
06-01 14:59:54.406: ERROR/ActivityManager(65): 1.7% 65/
system_server: 1.7% user + 0% kernel
06-01 14:59:54.406: ERROR/ActivityManager(65): 1.7% 74/Binder
Thread #: 1.7% user + 0% kernel
06-01 14:59:54.406: ERROR/ActivityManager(65): 1.7% 230/Binder
Thread #: 0% user + 1.7% kernel
06-01 14:59:54.406: ERROR/ActivityManager(65): 100% TOTAL: 78% user +
21% kernel

what is the meaning of the error? what caused the error?
thanks in advance.

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