Dynamics Plugin throwing "Could not load file or assembly" error - plugins

I have a Dynamics365 Plugin which references a Nuget written by me. The build and the registration of the Plugin works and also the merge of all Libraries worked.
When the Plugin is triggered I get the following error:
Error 'System.IO.FileNotFoundException: Could not load file or assembly
'CustomNuget.Xrm.Common.XYZ, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its
dependencies. The system cannot find the file specified.
The Assembly mentioned in the above error is the Nuget included in the Plugin.
What I know for sure is that this exception is thrown from within a Method which is contained in the above mentioned Assembly (Nuget).
When I check the plugin assemby with ILSpy everything looks ok.
How can this be that an exception is telling me the assembly was not found but the error was thrown exactly from this assembly??
Does anybody have an idea?

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Unable to resolve "Could not load file or assembly" exception in .net framework application

After upgrading the FluentValidation NuGet package in my WPF application from version 11.0.2 to 11.4.0, I began to receive the following error when attempting to execute my test suite:
System.IO.FileLoadException
HResult=0x80131040
Message=Could not load file or assembly 'System.Threading.Tasks.Extensions, Version=4.2.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
Source=FluentValidation
My NuGet packages folder contains the system.threading.tasks.extensions package for versions 4.4.2 and 4.5.4, but not 4.2.0.0.
I am not sure why I am getting this error, or how to resolve it.
I have reviewed the answers to questions by others having similar problems, but without finding a solution.

how to get nuget unity

I referred to this one
https://learn.microsoft.com/en-us/visualstudio/cross-platform/unity-scripting-upgrade?view=vs-2017#taking-advantage-of-net-compatibility
i attempted to get nuget npgsql and microsoft office
but this error is occured.
Assembly 'Assets/Plugin/Microsoft.Office.Interop.Excel.dll' will not be loaded due to errors:
Unable to resolve reference 'office'. Is the assembly missing or incompatible with the current platform?
Reference validation can be disabled in the Plugin Inspector.
Unable to resolve reference 'Microsoft.Vbe.Interop'. Is the assembly missing or incompatible with the current platform?
it was same to happen exactly like npgsql
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You might want to check out this asset: https://github.com/GlitchEnzo/NuGetForUnity

Get error trying to build for WebGL on Unity

Get error with UnityLinker.exe trying to build project for WebGL.
errors
I think this is the most important part:
Unhandled Exception: System.IO.FileNotFoundException: Could not load file or assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies. The system cannot find the file specified.
at Unity.Linker.UnityDriver..ctor(String[] args)
at Unity.Linker.Program.Main(String[] args)
What can I do? I searched but can't find a solution
It seems that you have installed wrong version of WebGL module. Try to reinstall it by Unity Downloader.

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I'm trying to debug my custom workflow assembly using the plugin registration tool for the first time. We are using CRM 2013 on-premise version.
However in setting up the profiler, I got this error below about my mismatched version of 'Microsoft.Xrm.Sdk.Workflow'.
Unhandled Exception: System.IO.FileLoadException: Could not load file or assembly 'Microsoft.Xrm.Sdk.Workflow, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)........................
I see that my Microsoft.Xrm.Sdk.Workflow version in the reference property is actually 5.0.0.0. However when I delete and re-add the reference (from the CRM 2013 SDK), then it shows a different version 5.0.9690.3739.
I read other questions about this, but I don't exactly understand how to synch the correct version together. Could someone please let me know how to do this step-by-step - if I need to change the one on the CRM server.
Notice the difference version between the two pics.

Which is the right version for Fasterflect using SNAP?

When using autofac with snap, I encounter the following exception:
Test method Halcyon.Mall.Logging.LogCallTests.FooLogCallInterceptor_ShouldBeCalled threw exception:
Autofac.Core.DependencyResolutionException: An exception was thrown while executing a resolve operation. See the InnerException for details. ---> System.IO.FileLoadException: Could not load file or assembly 'Fasterflect, Version=2.0.1.0, Culture=neutral, PublicKeyToken=a64e1179c81b1e25' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
The autofac (2.5.2.830) is installed as a nuget package manually.
The fasterflect (2.0.4429.39723) is installed automatically as a dependent package of SNAP (1.7.3)
I had the same problem today with Snap 1.7.7 -- the latest version. Snap.StructureMap appears to require Fasterflect 2.0 but a NuGet of Snap 1.7.7 retrieves the latest Fasterflect, which is 2.1. I was able to solve it by downloading Fasterflect 2.0.2 using NuGet in a separate project (PM> Install-Package Fasterflect -version 2.0.2), then deleting the existing reference to Fasterflect from my main project, then browsing to and adding a file-based reference to the older Fasterflect 2.0.2 DLL.