To be honest I don't even know what is happening because your description is somewhat vague. You say an error pops up, but what is the error specifically (Check error.txt before you tell me it's gibberish please)
Yeah... If you have two editors running at the same time, that's the biggest issue. Make sure you only have one running next time, before you start asking for help.. hehe.
Your <SOU command has an accidental space. Other than that, everything seems fine to me. Sometimes you really need to check out your script for any spaces and such, or else the whole event will go bye-bye.