Could not load file or assembly 'Esri.FileGDBAPI.DLL' or one of its dependencies. The specified module could not be found

[elvischan0302]

I have a web application using C# with .net framework 4.6.1. System throws an error "Could not load file or assembly 'Esri.FileGDBAPI.DLL' or one of its dependencies. The specified module could not be found".
I have already put FileGDBAPI.dll and FileGDBAPID.dll into bin folder.
Does anyone know what's problem?

[kuntadynithesh]

I am facing the same issue . tried all the solutions provided . Copying to same directory and rest . None seems to be working

[DGuidi]

I tried a web application in iis and it works for me. Try to check to build a x64 web app and deploy to iis in a 64bit manchine using default app pool, or build a 32bit web app and enable 32bit execution in the same default app pool