Can't find Modkit Link

Recently I got a strange probem with Modkit, every time when I run the Modkit VEX, it will pop up a info said can’t find the Modkit Link! See the attached screenshot, but I’m sure the Link is running, I also try to restart Modkit Link,even restart my laptop, but it keeps pop up this info. I’m not sure if it’s a software bug or something else, I’m using the version of Modkit_VEX_2016_09_01.exe, and my laptop with Win 8.1 Pro OS.

Anyone got this problem before? any ideas will be appreciated.

Thanks in advance.