memory low message

Chrylck Said:

"memory low message: Can’t clear the computer is low on memory message"

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View the Activity Monitor:

To see what is using most of the RAM view it using the Activity Monitor, close whatever it is. Perhaps, it is a scan that is always going on in the background? Go Here:  View memory usage in Activity Monitor on Mac.

Rid of the Security Software:

Moreover: Rid your Mac of that A/V and Security Software. It's unneeded on a Mac, as it just gets in the way. This is a pure example of it getting in the way. I see no icon on that message window referring to an app. You are getting that message most likely because of the software installed that is used for managing your Mac.

Use an Uninstaller for the Software:

Removing Security Software from your Applications folder will not rid of it all, as much of it will remain in your system cache. So, contact the developer and request the uninstaller.

If you are referring to storage space, you need to move or delete files movies, videos, to create space. If you managed to fill up the drive to the point where it is no longer functional, you would need to boot from an external source and try to accessthe hard drive to delete enough files to be able to boot with it.