Hello, I didn't find anything helpful in the knowledgebase or through google, therefore I'll post my problem here. I have a project that did exactly what it is intended to do, one week ago (including failure free Debugging on µC). Now I get the error 56 mentioned above when I try to debug it on the µC but I did NOT change anything, neither code nor configuration! Is this a bug? Did anybody experience the same problem before? And why isn't there an entry in the knowledgebase, although there is a list with all errors and warnings implemented by Keil? The µC is a C164CI and the code is a bit too long to post it here, but of course I will do it, if it's necessary to solve the problem. I also don't know what further information you will need cause I don't have any idea what the problem might be. So feel free to ask whatever you want :) Thanks in advance for any helpful advice. Greets, Jan