CCS: my ccs can not deubg

Can you please provide some more information?

What version of CCS are you using?
What host operating system are you on?
What device are you debugging?
What debug probe are you using?

I have seen this issue recently with an MSP432 Device and a Segger J-Link Debug probe. If that is what you are using then the issue is in the Segger software and we have informed Segger of the issue. There is a way to work around this problem by doing the following to launch a debug session.

Go to the View menu and select target configurations
Find your project and expand the targetConfigs folder inside it
Right click on the ccxml file and select Launch Selected Configuration
This will start the debugger
Once the debug perspective is open select the Cortex M in the Debug view and click on the connect button or right click and select connect.
Now click on the load program button and select your program to load.

If you are using a different device please provide the requested information and I can attempt to help you.

Regards,
John