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Hi, I'm new to Keil but have been working with micros for many years. I am using Keil vision 2 and am programming a Cypress USB chip. The code compiles with no errors. I can download it from Cypress EZ-USB GUI, and it works fine. When I click on the start/stop debug session I get the error message "could not load file , xxxmyfile, debugger aborted". If I choose not to load the application at start up under the debugging options, I can run the program but it isn't functioning correctly (as is does when I download it by Cypress EZ-USB). The problem seems to be listed in the xx.m51 file as UNRESOLVED EXTERNAL SYMBOL for a couple of cases. I'm probably missing something very dumb so expect I might get flamed.