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CCS/LAUNCHXL-CC2640R2: not able to start running / debugging project EMPTY on launchpad

Part Number: LAUNCHXL-CC2640R2


Tool/software: Code Composer Studio

project empty builds ok but when i start running / debugging an connected and powered launch board i get :

Cortex_M3_0: GEL Output: Memory Map Initialization Complete.
Cortex_M3_0: GEL Output: Board Reset Complete.
Cortex_M3_0: Can't Run Target CPU: (Error -2134 @ 0x0) Unable to control device execution state. Reset the device, and retry the operation. If error persists, confirm configuration, power-cycle the board, and/or try more reliable JTAG settings (e.g. lower TCLK). (Emulation package 8.3.0.00003)
Cortex_M3_0: Error: (Error -1170 @ 0x0) Unable to access the DAP. Reset the device, and retry the operation. If error persists, confirm configuration, power-cycle the board, and/or try more reliable JTAG settings (e.g. lower TCLK). (Emulation package 8.3.0.00003)
Cortex_M3_0: Unable to determine target status after 20 attempts
Cortex_M3_0: Failed to remove the debug state from the target before disconnecting.  There may still be breakpoint op-codes embedded in program memory.  It is recommended that you reset the emulator before you connect and reload your program before you continue debugging
Cortex_M3_0:   Failed to write data to temporary buffer in RAM before programming device FLASH memory. addr=0x20000C00, writeLength=4096(0x1000), bufIdx=0 Error: Could not write 0x20000C00: target is not connected
Cortex_M3_0: File Loader: Memory write failed: Failed to write data to temporary buffer in RAM before programming device FLASH memory.
Cortex_M3_0: GEL: File: D:\Users\peter\ccs9-test\empty_CC2640R2_LAUNCHXL_tirtos_ccs\Debug\empty_CC2640R2_LAUNCHXL_tirtos_ccs.out: Load failed.

what might be worng ?

am i missing something ?

used CCS 9.2.0.00013 + simplelink_cc2640r2_sdk_3_30_00_20

thx, peter