I'm using lpc1768 controller for my application. While edit and download the source code to controller i got an error "unable to enter debug mode","Flash Download failed - Target DLL has been cancelled". After getting this error i can't download or erase flash memory. I search about this error to some sites and someone gives the suggestion of modify flash tools->debug settings. I tried that but no use. I attached a screenshot to it. I expect someone gives the solution. Thanks in advance.