Very Computer

1. swapon: swap: Invalid argument

I defined a swap file named swap using all the book requirements
              # dd if=/dev/zero of=swap bs=1024 count=130752
              # mkswap swap 130752
              # sync
              # /sbin/swapon swap
after the last command I get the message:

                               swapon: swap: Invalid argument

and the swap doesn't turn on.

Does anyone have an explanation?
                                         Thanks in advance for your help,
                                                                   Rafael.

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