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CC2538EM Reprogram Error - Uniflash

Other Parts Discussed in Thread: UNIFLASH, CC2538, FLASH-PROGRAMMER

After a week of being able to successfully program the CC2538EM, I can no longer get past the "Connecting to target..." step. Here is the output from uniflash.sh:

uniflash.sh -ccxml cc2538em.ccxml -targetOp reset -program main.elf -targetOp reset

***** Texas Instruments Universal Flash Programmer *****

<START: 19:48:23 GMT-0400 (EDT)>

> Configuring the Flash Programmer with the given configuration ...

flxInitLoad: client has not been protected.
flxInitLoad: client has not been protected.
> Flash Manager is configured for the following part: CC2538

> Connecting to the target for Flash operations ...

SEVERE: CS_DAP_0: Error connecting to the target: (Error -241 @ 0x0) A router subpath could not be accessed. A security error has probably occurred. (Emulation package 5.1.8.0)

SEVERE: emulation failure occurred
SEVERE: Error connecting to the target: emulation failure occurred
> Error connecting to target.

<END: 19:48:27 GMT-0400 (EDT)>

<Total Time: 4.065s>

Anyone know how to fix this?

I've tried swapping out both CC2538EM and SmartRF06 boards and all manners of restarting, resetting and reconnecting. I'm using UNIFLASH2.1.0.00009_linux on Ubuntu 12.10. If there are any logs or other debug output I can post let me know.