We are having trouble logging into our account on the Quickbooks Intuit POS. We get this error message: "Value cannot be null Parameter name: source." Tried uninstalling.

We are having trouble logging into our account on the Quickbooks Intuit POS. We get this error message: "Value cannot be null Parameter name: source." Tried uninstalling and reinstalling with no luck. 

Answer

Thank you for bringing this to our attention, jackwhcc.

I can help you resolve the error you encounter when logging in to your Quickbooks Intuit POS.

This error may be caused by the Database manager, Microsoft.NET framework or by the computer's system requirements.

Before we start troubleshooting, make sure that your computer meets System requirements for QuickBooks Desktop Point of Sale, you're able to run the QBPOS Database Manager.

Make sure to follow the solutions in order. 

Solution 1: Make sure all Point of Sale updates are installed

Go to the product updates page and follow the instructions to install a Manual update.

Solution 2: Try a new Windows user

Create a new account for your computer. Set this as the Administrator. Log off Windows, sign in as the user you just created and try to open Point of Sale again.

Solution 3: Close and restart QBPOSShell and troubleshoot compatibility

Open your task manager, then go to your Processes tab and right-click QBPOSShell.exe, then select End Process. Close your task manager and open your POS.

Solution 4: Uninstall and reinstall .NET framework and QuickBooks Point of Sale
  1. Uninstall QuickBooks Point of Sale
  2. Uninstall .NET Framework 4.0 and 4.5.
  3. Install .NET Framework 4.5 (4.0 Client and Extended built in.
  4. Reinstall Point of Sale.

See this resolve unexpected errors when opening POS article for detailed guidance. 

That should help you log in to your account successfully. Let me know if you have questions with the troubleshooting steps provided. I'm always here to assist. Have a great rest of the day. 
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IntuitMaryJoy , Community Support Specialist
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