Unable to locate a local database runtime installation. Verify that SQL server express is properly install and that the local databse run time feature is enable error in C#

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C#

i face this error when i create connection with local db of SQL server 2014,
i create c# winform application when i run my application on client computer  it show me this error message .

please any one tell me how can i solve it i want to run my application on client computer without installing the SQL server 2014 on client machine.
i install local db for sql server 2014 in Clint machine but still it show me this error message.

i'm to much tired to solve this error please help me

What I have tried:

i have no idea how can i remove it.
its my config file

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
   <connectionStrings>
     <add name="dbx"
            connectionString="Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename='|DataDirectory|\db\RetilShop_POS.mdf';Integrated Security=True"
            providerName="System.Data.SqlClient"/>
   </connectionStrings>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
    </startup>
</configuration>