Multiple Causes can be Responsible for Sage Error: “Cannot open the company file. A required data file is missing”:

This error is caused by more than one reason. Below is the list of many causes that have been identified:

• The latest Sage 50 20xx version is not installed
• It can cause due to lost server connection
• Company data has been moved to a new computer
• The icon file (.SAI) and the data folder (.SAJ) don’t have matching names
• Multi-user not created or used
• The icon file (.SAI) or the data folder (.SAJ) is missing
• The company file is already opened by another Sage 50 program or another process or program on the computer
• The company file (SAI file and SAJ folder) are saved inside a SAJ folder which confuses Sage 50 when restoring the backup
• Some of the files or folders in the SAJ folder are hidden
• The backup may not have been done properly
• The data file has a pound sign (#) or weird character in the file name
• Some of the files or folders in the SAJ folder have restricted rights for the Windows user

Prerequisites Points need to Consider:

• The first thing is the latest version of the Sage 50 application should be installed before trying this troubleshooting.
• Make sure that the data file location is not being synced to One Drive, Dropbox, Google Drive, or any other cloud file services.
  • If the data should reside on C:\, move the data to the C:\Sage 50 Data or create a new folder if it does not exist
• If this problem occurs every time you share a file on Sage Drive, you should run a malware/spyware scan. It is also advised that you install a subscription antivirus and antispyware suite.
• Make sure there are no # signs or unusual characters in the file name.
• Do not use Windows Explorer to access the backup. Using the restore wizard, restore the backup.
• If the SAI file and SAJ folder are missing after doing the 2020.1 updates, you may need to find a recent backup in Windows Explorer.

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