CCS/TMS320C6678: JTAG connection error:The JTAG IR and DR scan-paths cannot circulate bits, they may be broken.

Tool/software: Code Composer Studio

I designed a  custome board,and I changed it's  JTAG interface.

The EVM 's jtag design is 2*7 header as below.

I changed it to 2*5 header:

The actual connection relationship is :

The white header on top is 2*5 header , the three floating line is connecting to GROUND pin of  Wintech Emulator.

Because my design is 4 pin(including a KEY pin) less than EVM board,three GROUND line is left .

I  connect the 2*5 header to my board's header, and I connect the three floating GROUND line to GROUND of my board.

Is this OK?

When I  use CCS to connect the TMS320C6678,the error occurs.

IcePick_D: Error connecting to the target: (Error -233 @ 0x0) The JTAG IR and DR scan-paths cannot circulate bits, they may be broken. An attempt to scan the JTAG scan-path has failed. The target's JTAG scan-path appears to be broken with a stuck-at-ones or stuck-at-zero fault. (Emulation package 5.0.872.0)

Please  help me ,thanks.