The message, “We’re sorry. QuickBooks encountered a problem. Error Codes: (-6000, -77) pops up on your screen when you encounter QuickBooks error 6000 77. The issue arises when you try to access your company file. The company file is an important element of QuickBooks that stores an organization's sensitive data. Incurring problems while opening it can be troublesome and annoying. To fix the issues instantly and effectively, go through this detailed article until the end. 
 If you have any concerns regarding QuickBooks company file error 6000 77, feel free to have a one-to-one conversation with the QuickBooks technical experts team via our Toll-Free 1.800.579.0391. 
What are the Reasons that Triggers QuickBooks Desktop Error Code 6000 77? 
Following are the possible reasons to encounter the company file error 6000 77- 
 The configuration files, ‘.ND’ and ‘.TLG’ files, have been damaged. 
You have not configured the settings of your Windows firewall.
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How to Rectify the Error Code 6000 77 in QuickBooks?
The below-mentioned troubleshooting methods will help you to get rid of the issue- 
SOLUTION 1: Rename the .ND and .TLG Configuration Files
Open ‘My Computer’ or ‘This PC’ on your Windows desktop. 
Go to the ‘C: Drive’ to access the company file folder. The path is as follows: C:\Users\Public\Public Documents\Intuit\QuickBooks\Company Files.
Now, locate the files that have a similar name to that of your company file along with the extensions .TLG and .ND. 
Right-click on those files to rename them. Select the ‘Rename’ option and edit the names by adding ‘.OLD’ at the end of the file names. 
Press ‘Enter’ to save the changes.
If renaming these files does not solve your problem, check out the next solution. 
SOLUTION 2: Install QuickBooks Tool Hub to Use File Doctor Tool
Download the QuickBooks Tool Hub application. You need to download the latest version. 
Save the ‘QuickBooksToolHub.exe’ file to a location where you can access it easily. 
Run the file and perform the installation procedure. Move forward with the instructions displayed on the screen. 
Once the application is installed, go to your Windows desktop and open the Tool Hub. 
Go to the ‘Company File Issues’ menu and hit ‘Run QuickBooks File Doctor’. 
Now, you require to click on the drop-down arrow and choose your company file. 
Choose the ‘Check your file’ option and then tap ‘Continue’. 
At last, provide your QuickBooks admin password and hit ‘Next’. Let the tool function and scan for the issues to resolve them. After it is done, run QuickBooks Desktop to open your company file. 
We have tried our best to guide you with the solutions to get through the QuickBooks error 6000 77 that appears while trying to open the company file. Apart from these troubleshooting methods, you can also adjust your Windows Firewall Settings. If none of the solutions fixes your error, we recommend you speak to one of our professionals at 1.800.579.0391. 
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