Hi JQ,
I think you have not installed the KSDK correctly .
Now ,you create project ,choose FRDM-K64, then click NEXT, check whether the "Kinetis SDK " can choose ?
Please Show your screenshot like mine :

And please refer to the " Getting Started with Kinetis SDK (KSDK) .pdf(C:\Freescale\KSDK_1.1.0\doc) -> 5.2 Install Eclipse update"
update your KSDK .
Best Regards
Alice