SQL Network Interfaces, error: 50 - Local Database Runtime error occurred. Error occurred during LocalDB instance startup: SQL Server process failed to start

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ASP.NET

MVC

hello i created mvc5 project and Authentication is individual user acounts

when i try to register is give me the following error

SQL Network Interfaces, error: 50 - Local Database Runtime error occurred. Error occurred during LocalDB instance startup: SQL Server process failed to start

i checked my sql server managment studio did not find in db created

also i checked APP_Data folder did not find any db files


i checked connection string in config file

<connectionStrings>
    <add name="DefaultConnection" connectionString="Data Source=(LocalDb)\v11.0;AttachDbFilename=|DataDirectory|\aspnet-Identity-20150621113906.mdf;Initial Catalog=aspnet-Identity-20150621113906;Integrated Security=True"
      providerName="System.Data.SqlClient" />
  </connectionStrings>

i don't know where database suppose to be ?? i'm new to mvc ( project is mvc5)

is there any missing configurations ??