The error message shows that the problem appears to be caused by the instance not functioning properly. You can solve your previous problem before proceeding. One of our colleagues has already answered another question, you can go and check it out.
Best regards,
Percy Tang
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The error says "The project could not be deployed to the 'DESKTOP-MPRLDLP\SQL_2012' server because of the following connectivity problems : A connection cannot be made. Ensure that the server is running. To verify or update the name of the target server, right-click on the project in Solution Explorer, select Project Properties, click on the Deployment tab, and then enter the name of the server."
I think its from the sql configuration manager. I changed the account to local system and i tried changing it back but its requesting for password