Arduino Error: avrdude: stk500_recv(): programmer is not responding

Development Tools IDE 1.x
1

Hello guys,
Im making my project using Arduino,later it was working better with uploads and other functionality,
Now today in uploading code its saying this error and it doesnt uploads anymore,
I have searched about how to resolve this issue so far,, but none of them worked for me,

Cannot upload sketches to Arduino Uno R3 -- avrdude: stk500_recv(): programmer is not responding - Stack Overflow

arduino uno - How do I resolve "avrdude: stk500_recv(): programmer is not responding"? - Arduino Stack Exchange

guys not only these seacrhed,,i did so many from this issue,,but im totally stucked,
Help me please!!

Below is the error i got

Sketch uses 928 bytes (2%) of program storage space. Maximum is 32256 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes for local variables. Maximum is 2048 bytes.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x9f
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x9f
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x9f
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x9f
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x9f
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x9f
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x9f
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x9f
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x9f
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x9f
Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.

2

I have had this happen when the IO pins connected to the serial port are connected to things. Check the reference information to determine which pins these are (0 and 1 I think) and see if removing connections to them resolves the issue.