I have a MDBT40 developing board and a ST-Link. I flashed some example programs like UART and Beacon. And they are perfectly working. But when I flashed other programs it is showing "No J-Link found".

Please help me to flash with ST-link.
I have a MDBT40 developing board and a ST-Link. I flashed some example programs like UART and Beacon. And they are perfectly working. But when I flashed other programs it is showing "No J-Link found".

Please help me to flash with ST-link.
This probably means that you have J-link selected in your project configuration. Just go to Project->Options for Target 'whatever', and change the debugger to ST-Link Debugger as shown below.

OK.No J-link is found is gone. But new problem is raised.

"Error: Flash Download failed - "Cortex-M0""
OK.No J-link is found is gone. But new problem is raised.

"Error: Flash Download failed - "Cortex-M0""