MISSING DEVICE (R003: SECURITY KEY NOT FOUND) Running in Eval Mode???

By the way, what message "MISSING DEVICE (R003: SECURITY KEY NOT FOUND) Running in Eval Mode" means? I'm using Keil with GCC, because Keil compiler has a limit for code size. When I upload program into LCP2129, via ULINK, Keil shows this message. Are there any other limitations about Keil?

Than You, Mirek.

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