CC3135: FS_WRONG_SIGNATURE Error When Programming Certificates

Tool/software:

I'm attempting to load some dummy certificates to a CC3135 (on our custom board) using dslite.bat.  When I do I get a FS_WRONG_SIGNATURE Error.

Here is what I enter for my command and the resulting output:

C:\ti\uniflash_9.0.0>dslite.bat --mode cc32xx image program --file C:\ti\uniflash_9.0.0\prog.sli --port COM4
Executing the following command:
> C:\ti\uniflash_9.0.0\simplelink\imagecreator\bin\SLImageCreator.exe image program --file C:\ti\uniflash_9.0.0\prog.sli --port COM4

For more details and examples, please refer to the UniFlash Quick Start guide.

INFO:slbootloader.slbootloader:Connecting to device
INFO:slbootloader.slbootloader:--- Please power off the device ---
Press ENTER to continue
INFO:slbootloader.slbootloader:Power off
INFO:slbootloader.slbootloader:Set break signal
INFO:slbootloader.slbootloader:--- Please power on the device ---
INFO:slbootloader.slbootloader:Power on
INFO:slbootloader.slbootloader:Clear break signal
INFO:slbootloader.slbootloader:Connection succeeded
INFO:slbootloader.slbootloader:Received storage list
Image Programming: 94% (49152/52000)INFO:slbootloader.slbootloader:Received error : error number = -10289 , extended error = 2694
Traceback (most recent call last):
  File "SLImageCreator.py", line 5740, in <module>
  File "SLImageCreator.py", line 5735, in main
  File "SLImageCreator.py", line 5704, in cmdline
  File "SLImageCreator.py", line 4482, in command_image_program
  File "SLImageCreator.py", line 3058, in program_image_from_sli
  File "SLImageCreator.py", line 3221, in program_image
  File "slbootloader\slbootloader.py", line 824, in fs_programming
slbootloader.slbootloader.BootLoaderError:
Error: SLImageCreator.exe: fs_programming error: ret: -10289, ex_err: 2694 - FS_WRONG_SIGNATURE
[23816] Failed to execute script 'SLImageCreator' due to unhandled exception!

Any suggestions on how to troubleshoot this would be great!

Thanks!