Hi,
1. please make sure you didn't import the projects with breakpoints.
2. regarding you use FRDM-K64F board, I suggest you check this article for several method to connect to FRMD-K64F board.
Summary of FRDM-K64F open source debug interface
3. if you want to use CMSIS-DAP debug interface anyway,
You can download CMSIS-DAP deliverables from ARM via the link below (requires login).
https://silver.arm.com/browse/CMSISDAP
Can this help you?
Have a great day,
Zhang Jun
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