Lack of the disk space in the drive consisting of the company is considered to be the main reason for the occurrence of the QuickBooks error code 6000, 304. 

The error comes up with the message “An error occurred while QuickBooks tried to access the company file”. 

To get the QuickBooks error 6000, 304 resolved: 

You can try to relocate the company file to the hard disk that has more space. 

Also, turning off the data is required to get the error resolved. 

If the QuickBooks error 6000, 304 still seen, you can connect to QuickBooks enterprise support team by dialing +1-888-485-0289.