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Problem debugging DK-TM4C129X



Please, I need help debugging Tiva!

I'm using the kit DK-TM4C129X.
On the CI is printed:
XM4C129
XNDZADI1 <- It's revision A1, ok ??
37AK3SW

I already ran some examples and made a program that works very well.
In the project properties, in predefined symbols, it's defined "TARGET_IS_TM4C129_RA0".

Now I want to use functions available in the revision A1, then I changed
that definition to "TARGET_IS_TM4C129_RA1".

Then I built the same project and tried to debug, but the program crashed.
The screen went blank.

I tried to go back, setting again "TARGET_IS_TM4C129_RA0", but I'm not getting
run any program.
Always appears the message: "Error connecting to the target"
In the console: "CORTEX_M4_0: Error connecting to the target"

I already tried power off and power on the Kit and the PC, but does not solve.

Please,
somebody know why this happened and how can I solve it ?

Flavio