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I got Error -275 while trying to download program from CCS

Other Parts Discussed in Thread: CC2650

Hi, I'm trying to download a program to my CC2650EM via 20pin ARM JTAG connector on SmartRF06EB which usually work and then suddenly I got this error

Error connecting to the target:
(Error -275 @ 0x0)
The attempt to poll a target device exceeded its timeout limit.
The utility or debugger has requested that a target device be
repeatedly accessed for a specific data or status value.
This has failed because the built-in limit for the maximum number
of attempts when polling the JTAG scan-path has been exceeded.
(Emulation package 6.0.14.0)

what could be the problem and how can I fix this?