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CCS/TM4C129ENCPDT: Error connecting to the target:

Part Number: TM4C129ENCPDT

Tool/software: Code Composer Studio

Error connecting to the target:
(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 7.0.100.0)   USE  XDS200  CCS   Version: 7.4.0.00015 

  

very urgent!!!