Error 240 when updating to Radio 1.50

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I've been toying with recent radios (I keep getting that annoying "!" to indicate signal ever since I left my old radio). I'd like to try 1.50, but whenever I try to update with the pre-packaged RUU, I get a "Error 240: File Open" message. I tried to use CustomRUU to just use the .nbh, and CustomRUU does the same message. I unlocked my ATT device, which, I'm quite certain, installed Bootloader 1.40. I'm quite at a loss!

How do I get rid of that annoying message and update my radio?

Thanks!

vp3G 3.60.0
HardSPL 2.10

I had this same issue, I resolved it by moving the RUU Wrapper folder that contained the .exe and .nbh to the root of my hard drive and ran from there.

Hope this helps.

Thanks a lot for this tip.
I tried to solve this 240 error issue for hours...
Moving the files to the root of my HDD worked for me as well.

Merci beaucoup