DllNotFoundException problem

I made a unity project using external DLL made by C++. It first works fine. But one day it becomes to give DllNotFoundException error and won’t work any more. What I did between before and after is that I performed Windows Update as far as I remember.

Is it relevant? Or do you have any suggestion on this? Thank you.

I made it. This was a path problem. This problem happened after I moved the whole project to the different place and it caused the path problem of DLL dependency.

Thanks… (careless miss…)