Pandora ERROR

When I get to the step where I luanch Pandors battery firm installer, I get an error message:

the game could not be started

I tried it with a umd in as well, same error.

I am running this on the PSP that already had homebrew

format your memory stick, then try using the pandora battery easy installer located at the very top of pacmans tutorial.

I had to set 1.50 kernal mode under the recovery boot settings, it worked after that