Based on the error message, it seems there is an issue with the LocalDB instance failing to start.
Follow these steps to troubleshoot the issue:
1. Check the SQL Server LocalDB Service:
Open the Windows Services Manager and check if the SQL Server (MSSQLLocalDB) service is running. If it is not running, try starting the service manually.
2. Check the SQL Server LocalDB Instance:
Open a command prompt and try to connect to the LocalDB instance using the following command:
Copysqllocaldb i MSSQLLocalDB
3. If the instance does not exist, you may need to recreate it.
4. Verify LocalDB Installation:
Make sure that LocalDB is installed correctly on your system. You can check the installed instances by running:
Copysqllocaldb v
5. Check LocalDB Log Files:
Check the LocalDB log files for any errors or warnings that could provide more information about why the instance failed to start. The log files are typically located in:
C:\Users<YourUsername>\AppData\Local\Temp\
6. Use SQL Server Configuration Manager:
Open SQL Server Configuration Manager and check the configuration settings for the LocalDB instance. Ensure that the instance is configured correctly, and the necessary protocols are enabled.
7. Repair LocalDB Installation:
You can try repairing the LocalDB installation using the SQL Server installer. This may help resolve any corrupted files or configuration issues.
8. Update or Reinstall LocalDB:
If the issue persists, consider updating LocalDB to the latest version or reinstalling it to ensure a clean installation.
9. Check Firewall and Network Connectivity:
Ensure that the LocalDB instance is allowed through the Windows firewall and that there are no network connectivity issues preventing the instance from starting.
Reference:
https://learn.microsoft.com/en-us/answers/questions/1610167/help-i-dont-understand-why-i-cant-access-or-connec
