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I installed ram expander in my acer a500 tablet and get an error message: invalid arg

Hi, everyone
I install cm10.2 rom into my acer a500 last week.
I am sorry about I didn't describe it clearly, the system ram only left 12MB, and it did make my tablet too slow to run more app.
And I found the ram usage over 97%.
Some people would use swapper or ram expander by using swapfile.
Therefore, I use ram expander and grant "ram expander" as superuser privileges.
And the screen appears "invalid argument".

I went to the console terminal with the command "su -" and "chmod 777 swap.swp" to set the swap.swp
And still get the message "invalid argument".
After that, I use these command :"su -","swapon swap.swp" and I still get the same message:"invalid argument".
Could someone have some idea?
Thanks for everyone's help.
 
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