Situation: The hard disk of the workstation on which your company file is located has very little free space. You won't be able to enter much (if any) more information in your company file until more free space is available on the workstation's hard disk.
Solution: Remove some items from the workstation on which the company file is located. You may also want to consider increasing the size of the workstation's hard disk, since your company file will probably continue to increase in size over time.