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CCS/CC2650STK: Error -260 @ 0x0

Part Number: CC2650STK
Other Parts Discussed in Thread: UNIFLASH

Tool/software: Code Composer Studio

I am using CCS (Version: 7.1.0.00016) on MAC.  This worked just fine till this week. Now i get the following error during the download process. I download the file using 'debug' icon in CCS. I've validate CCS can recognize the XDS110 debugger and do not see any error.

Cortex_M3_0: GEL Output: Memory Map Initialization Complete.

Cortex_M3_0: GEL Output: Memory Map Initialization Complete.

Cortex_M3_0: Failed Board Reset: (Error -260 @ 0x0) An attempt to connect to the XDS110 failed. The cause may be one or more of: no XDS110 is connected, invalid firmware update, invalid XDS110 serial number, or faulty USB cable. The firmware and serial number may be updated using the xdsdfu utility found in the .../ccs_base/common/uscif/xds110 directory of your installation. View the ReadMe.txt file there for instructions. (Emulation package 6.0.628.1) 

Cortex_M3_0: GEL Output: Board Reset Complete.

Error connecting to the target:

(Error -260 @ 0x0)

An attempt to connect to the XDS110 failed.

The cause may be one or more of: no XDS110 is connected, invalid

firmware update, invalid XDS110 serial number, or faulty USB

cable. The firmware and serial number may be updated using the

xdsdfu utility found in the .../ccs_base/common/uscif/xds110

directory of your installation. View the ReadMe.txt file there

for instructions.

(Emulation package 6.0.628.1)

IcePick_C: Error connecting to the target: (Error -260 @ 0x0) An attempt to connect to the XDS110 failed. The cause may be one or more of: no XDS110 is connected, invalid firmware update, invalid XDS110 serial number, or faulty USB cable. The firmware and serial number may be updated using the xdsdfu utility found in the .../ccs_base/common/uscif/xds110 directory of your installation. View the ReadMe.txt file there for instructions. (Emulation package 6.0.628.1) 

IcePick_C: Error connecting to the target: (Error -260 @ 0x0) An attempt to connect to the XDS110 failed. The cause may be one or more of: no XDS110 is connected, invalid firmware update, invalid XDS110 serial number, or faulty USB cable. The firmware and serial number may be updated using the xdsdfu utility found in the .../ccs_base/common/uscif/xds110 directory of your installation. View the ReadMe.txt file there for instructions. (Emulation package 6.0.628.1) 

I am still able to download the firmware in FlashROM, just can't debug via FlashOnly_OAD.

Any thoughts on what may be causing the error?

I am using TI XDS110 debug probe.  i've read other posts on this error and reviewed http://processors.wiki.ti.com/index.php/Debugging_JTAG_Connectivity_Problems#Lost_control_of_device_execution_state

sincerely appreciate your help