Create web setup installer for the UAT project Web Form. ASP.net C#

I have no problem in rebuild the UAT file project. Rebuild UAT file project is a success and has no error. But once the UAT Web Setup has created, so to rebuild it got 1 failed. The error is:

ERROR: File 'NdefLibrary.dll' targeting 'AMD64' is not compatible with the project's target platform 'x86'

Image of the error (image link)

How supposed to solve this? Already searched but no solution found.

Also has try to change the compatibility platform under Build tab > Configuration Manager, but error still remain the same.