Connect to LocalDB from ASP.NET

I am running IIS 7.0 on windows 10 with .net 4.5. A local web app needs to access a local database localDB version 13.0.4001. My connection string is: "Data Source=(LocalDB)\MSSQLlocalDB;AttachDbFileName=|DataDirectory|\SSOL.mdf;Initial Catalog=SSOL;Integrated Security=True"

And, in my web app, I tried to connect to the localDB using SqlConnection conn = new SqlConnection(sqlConnStr);

It kept failing with error - Windows API call WaitForMultipleObjects returned error code: 575. Windows system error message is: {Application Error}
The application was unable to start correctly (0x%lx). Click OK to close the application.
Reported at line: 3730.

I have been stuck on this for 2 days. Any help is appreciated!