Client PC Fire Error

Question

Hello Geeks,

 

I have one windows appication for my client. I publish that windows application and send to my client. My client have freash PC. He tries to install setup that was publish by me. Install Successfully but when he gone for login so he get error pop-up as below.

 

My database Path and login Code:

 

 

 

App.config file:

 

 

 

 

 

This screenshot from my CLIENT PC. Error Pop My Client GET: