CAS program corrupts itself

[StephenG1CMZ]

I tried to implement this, but the only result I got was savage(0) or 0 instantly.
Then I saw your comment about a new cas syntax, so I deleted my first Cas code to try again. SAVAGE no longer shows in the directory.

I tried to create SAVAGE again and I get an error saying that a program called savage already exists.

I'm a novice at Cas so maybe I did something ridiculous rather than recreate some corruption.
I'm using the Android emulator.

Any suggestions on how to get rid of this invisible and undeletable savage program?
(I've recently cleared all data, so could easily do so again).

Update: I also seem to be getting a lot of Network Connection Unavailable messages lately - although the browser connects OK.