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Fatal error: The object file contains features not supported by the driver

Other Parts Discussed in Thread: CC2531EMK

I am using the following setup:

CC2531EMK (USB dongle) + CC Debugger + IAR (EW8051-EVKS-751A) + rf_modem example

I have added --ks_version and everything complies file, but when I go to download and debug, I get the following message:

Fatal error: The object file contains features not supported by the driver

I've done basically the same thing with the CC1111_dongle without any problems.

Can anyone explain what the issue is and if there is a workaround.

Thanks
Chris