The Located Assembly'S Manifest Definition Does Not Match the Assembly Reference

The located assembly's manifest definition does not match the assembly reference

The .NET Assembly loader:

is unable to find 1.2.0.203
but did find a 1.2.0.200

This assembly does not match what was requested and therefore you get this error.

In simple words, it can't find the assembly that was referenced. Make sure it can find the right assembly by putting it in the GAC or in the application path. Also see https://docs.microsoft.com/archive/blogs/junfeng/the-located-assemblys-manifest-definition-with-name-xxx-dll-does-not-match-the-assembly-reference.

Assembly's manifest definition does not match assembly reference

Here's how I managed to solve it:

Go to the solution explorer and choose Antlr under References, right-click and say properties. Make sure the file version is the same the compiler is looking for. In my case, MSBuild wanted version 5.5.0.2, but the reference properties showed an earlier 2.x version.

All I had to do is go to the package manager console and type:

PM> update-package Antlr

Then build the project again, and in-case you get the same error for more assemblies, update them as well. Your issue will be resolved

How to resolve The located assembly's manifest definition does not match the assembly reference. error?

The problem was that I had added reference of old unmodifed PdfiumViewer dll to another project.Hence, there was conflict between the two dlls (old and customized) at runtime.I removed the old dll reference and it worked.