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Solution 2: Open a sample company fileBy opening a sample company file, you are testing if the problem possibly lies with your company file or the QuickBooks application. If a sample company file does not open and instead returns an error, it is an indication that the QuickBooks installation is damaged and should be repaired.

1. In the No Company Open window, click the Open a Sample File button and choose any from the list of sample company files.
2. If the sample file opens, proceed to solution 3. I the sample file returns the same error message, repair your QuickBooks installation.

Solution 3: Copy the QuickBooks file on the desktop
By copying the file on the desktop and opening it, you are testing if there is a problem with the location of the company file. If the file opens while it is saved on the desktop, it means the location is probably damaged or it is "too deep", it exceeded the file system path limitation. If the file still did not open after changing it's location, it is possible the file is damaged.

1. Open the folder that contains your company file.
2. Find the file with the extension of .QBW.
3. Right-click on the file then select Copy.
4. Go to desktop, Right-click on the desktop and then select Paste.
5. While holding down the control key, open QuickBooks so you are directed to the No Company Open window.
6. Click Open or restore an existing company. Navigate to the desktop, find the company file you copied and open.
7. If you are still getting the same error, please proceed to solution 4.

You are opening the file over the networkThis means that you are opening the company file saved on the server or another computer.Solution 2: Rename the .ND and .TLG files and restart/rescan the Database Server ManagerThe .ND and .TLG files are part of your QuickBooks files. These are configuration files that allow QuickBooks to access a company file in a network or multi-user environment.
If these files are corrupted or damaged, you will encounter these errors when you open your QuickBooks files. Renaming these files will not cause you to lose QuickBooks data. These files are automatically re-created when you rescan using the QuickBooks Database Server Manager and when you open your company file.

1. Find the files with the same file name as your company files but with extensions .ND and .TLG.
Example:

• company_file.qbw.nd
• company_file.qbw.tlg

Right-click each file and select rename. Add the word OLD at the end of each file name. Ex: company_file.qbw.nd.OLD

The purpose of Database Server Manager is to host your QuickBooks company files. It is best to restart the DBSM and rescan the QuickBooks files after you rename the .ND and .TLG files.

1. Start > All Programs > QuickBooks > QuickBooks Database Server Manager
2. Click the Scan folders tab.
3. Click Add folder (if no folders are present). Otherwise, highlight the folder with the files and click scan.
4. Confirm that the company file in question shows in the bottom box with heading "QuickBooks company files found."
5. Try to open the file again.
6. Open QuickBooks again and try to sign in to your company file. If the same issue occurs, proceed to solution 3.