dm3730调试问题

Error connecting to the target:
(Error -1178 @ 0x6D)
Device functional clock appears to be off. Power-cycle the board. If error persists, confirm configuration and/or try more reliable JTAG settings (e.g. lower TCLK).
(Emulation package 5.0.569.0)
最近调试DM3730总是出现以上错误,这是什么造成的,应该如何改正,非常感谢