C# code works but errors occur while packaging my UWP application in Visual Studio 2017

I have created a UWP application in Visual Studio. I plan on using it only for side loading(it is a LOB app). It doesn't have any errors. But when I try to package it, I get the following errors.

Errors in Packaging

0X8007000b an attempt was made to load a program with an incorrect format

Also, here is my output console.

How do I fix this?

• From the solution explorer, double click and open Package.appxmanifest Click on Visual Assets tab on top. It is second from left, after Application tab.
• Select a source image (this is the image you want to use for logos, badges, splash screen, etc.)
• Under assets combo box, select all All Visual Assets
• Hit Generate
• Say ok that it will overwrite your existing files

Now, if you want to use a different image for any of the specific areas, for example, App Icon, scroll down, and provide a different source for it.

Now, build and make sure your app builds. Then attempt to create the app package again.