open port80 on sonicwall??

i would like to open port 80 on my sonicwall pro 240 to enable a surveillance camera to be viewed externally. i am not having luck with the wizard. i was told to enable one-to-one nat and enter the private ip(lan) and public (wan), 1 for range length. but i am getting error public address.

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cadnycAuthor Commented:
thank you, it worked!
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