Secure Erase Free Space

Secure Erase Free Space Failed
Secure Erase Free Space failed with the error:
Couldn't create temporary file.
Hello, I own a 15" Macbook Pro 2011 Late model but I recently replaced the hard drive with SSD and upgraded the memory to 16gb. It was working fine for about 4 months and now sometime it freezes while browsing or even opening an application. I had to restart the macbook and sometime I would get a white screen. I was able to get by the white screen by restarting constantly. I am afraid to shut this macbook down and end up with a white screen. While I got through the white screen, I was able to use the disk utility and got this message when I was cleaning up free space. My SSD has 431.82 GB free of 478.89 GB. Can anyone tell me where do I locate the temporary file or is there something else I need to fix? Please let me know. Thank you.
Vincent

I understands that.
But heres what Im talking about

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    That animated image of a bug in your signature is amusing, by the way.
    Message was edited by: Your New Favorite

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