Disk image error is full

Hey I need some help, I have a 6 month old mac book air and my mac says that I have 53.04 GB free, but every couple of says it will tell me that the disk image is full and will make me force close everything.... Then when I restart my computer, its fixed..... I installed a antivirus software for fear that it was a virus, but that hasn't helped the problem. I have tried apps like whatsize and OmniDiskSweeper, but that doesn't help because I can't run the programs when the disk image is full error comes up because it makes me force close everything.... and when I restart the macbook air, then the files are back to normal. Please help?!?!?!?!!?!?!?!

I don't see anything about a disk image being full.
Your problem is excessive swapping of data between physical memory and virtual memory.
That can happen for two reasons:
You have a long-running process with a memory leak (i.e., a bug), or
You don't have enough memory installed for your usage pattern.
Tracking down a memory leak can be difficult, and it may come down to a process of elimination. In Activity Monitor, select All Processes from the menu in the toolbar, if not already selected. Click the heading of the  Real Mem column in the process table twice to sort the table with the highest value at the top. If you don't see that column, select
View ▹ Columns ▹ Real Memory
from the menu bar.
If one process (excluding "kernel_task") is using much more memory than all the others, that could be an indication of a leak. A better indication would be a process that continually grabs more and more memory over time without ever releasing it.
If you don't have an obvious memory leak, your options are to install more memory (if possible) or to run fewer programs simultaneously.
The next suggestion is only for users familiar with the shell. For a more precise, but potentially misleading, test, run the following command: 
sudo leaks -nocontext -nostacks process | grep total
where process is the name of a process you suspect of leaking memory. Almost every process will leak some memory; the question is how much, and especially how much the leak increases with time. I can’t be more specific. See the leaks(1) man page and the Apple developer documentation for details:
Memory Usage Performance Guidelines: About the Virtual Memory System

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    I added an 1TB external usb hard disk to my time capsule as the existing 1TB hard disk is nearly full (less than 12 GB left on time capslule hard disk).  Initially, I connected external hard disk to my MacBookPro (late 2009 Intel machine) and erased most of the data on that disk. I added the disk to time machine's backup disks thru the time machine window in system preferences. Now I supposedly have both hard disks, the one in the time capsule and the new usb hard disk, available for backup. Time Machine immediately backed up my system, which consists of my MacBookPro hard disk (about 96.8 GB) and another external usb hard disk which contains about 500 GB of data, on the new extenal hard disk.Time Machine did not attempt to create a new sparsebundle at that time on my new external backup disk.  This backup was done while the new backup hard disk and the data disk were both connected to the MacBookPro and the Time Capsule was directly connected by ethernet cable to the MacBookPro. I then disconnected the two hard disks from the MacBookPro and reconnected them both via usb to the Time Capsule. Now, hopefully, the external usb backup hard disk can be written to via wi-fi thru the usb connection thru the Time Capsule? I successfully use the data disk (which contains my full iTunes Library) from the Time Capsule all of the time.
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    Gary Olson

    I'm not sure this is at the root of your problems, but Time Machine manages backups to a local disk differently than to a network disk.  The Time Machine backup written to the disk while it was connected locally can't be used for network backups.

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