Unable to open file; file may be locked or in use, or access privileges may be  incorrect...disk may be full.

Troubleshooting Alert Messages Overview > Alert messages (in alphabetical order) > Unable to open file; file may be locked...
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Situation: This message may appear for a number of reasons. Possible causes might be that the company file is locked, access privileges for the company file is stored may be incorrect, or there may not be enough room on the workstation where the company file is stored. You might also receive this message if a person at a different workstation is performing a function with MYOB Accounting Plus that requires that only one workstation access the company file during that function.

Solution: Check to see that you have given full (read/write) access to the folder where your company file is located; in other words, be sure that all workstations are allowed to make changes to the file within the location you selected for the company file.

If you have very little room on the hard disk where your company file is stored, remove some items from the workstation. 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.

If another workstation is performing a single-user function, simply wait for the function to be completed, and then open the company file.