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CCS/CC3220SF-LAUNCHXL: Unable to debug target in development mode - (Error -260 @ 0x0)

Part Number: CC3220SF-LAUNCHXL
Other Parts Discussed in Thread: UNIFLASH

Tool/software: Code Composer Studio

I have been working with this device for a while now, and I successfully debugged example code, as well as an example edited by a coworker. Having made some changes myself I am now getting an error message when starting a debug session:

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 7.0.188.0)

I have programmed the device with my project files using uniflash, it says my device in in development mode, and the uniflash project is set to development also. My SOP jumpers are set to 010 (according to documentation this is correct for 4-wire JTAG connections. I have defined __DEBUG_SF__ as a predefined symbol in my build. I checked my target configuration, which is set correctly to JTAG.

I also am no longer able to debug the examples.

I have run out of things to try at this point, requesting reinforcements.