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Computercraft Error Help!


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Ok, I would usually go to the computercraft forums, but apparently I can't post any topics. Anyways, I was getting an error I couldn't understand how to fix. Here is my code:




event, e=os.pullEvent("key")

print"Test text"

while true do

if e==25 then

shell.run("lock") -- this is a password program I have set up




Anyways, what this program does is basically writes something on my monitor, and when P is pressed, it runs a password system. However, after about 10 seconds, an error comes up: nil: vm error: java.lang.NullPointerException

I have no idea what this means, or what is causing it XD

any help would be appreciated. Thanks

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Could it be in the lock program?
Well, the lock program works when I isolate it to itself. Also, I haven't even pressed the event key P to launch the Lock program, so I don't think the lock would be a problem. My sign just flashes off, then when I open the computer, that error comes up(after I type startup or reboot).
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