[.net] Could not load file or assembly '***.dll' or one of its dependencies

Had the same issue and got it resolved by making sure projects in the solution have the same configuration and platform (in my case it was Debug x64). Somehow the VIsual Studio was missing x64 for part of the projects and I edited the .sln file manually (copied the configurations and platforms from correctly built projects to the projects that were missing the settings I needed). This is what it looks like for one of the projects:

{1BA29980-EE5D-4476-AFFC-0F177B6C9865}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{1BA29980-EE5D-4476-AFFC-0F177B6C9865}.Debug|Any CPU.Build.0 = Debug|Any CPU
{1BA29980-EE5D-4476-AFFC-0F177B6C9865}.Debug|x64.ActiveCfg = Debug|x64
{1BA29980-EE5D-4476-AFFC-0F177B6C9865}.Debug|x64.Build.0 = Debug|x64
{1BA29980-EE5D-4476-AFFC-0F177B6C9865}.Release|Any CPU.ActiveCfg = Release|Any CPU
{1BA29980-EE5D-4476-AFFC-0F177B6C9865}.Release|Any CPU.Build.0 = Release|Any CPU
{1BA29980-EE5D-4476-AFFC-0F177B6C9865}.Release|x64.ActiveCfg = Release|x64
{1BA29980-EE5D-4476-AFFC-0F177B6C9865}.Release|x64.Build.0 = Release|x64

But then the same error occurred for a project that had a Java file (*.jar) in the dependencies. I had to edit Environment Variables manually to create a record with this value

C:\Program Files\Java\jre1.8.0_171\bin\server

for Java's path, and put it on top of the Path items.

This fixed the issue until I updated Java on my machine. I had to edit the version number in Environment Variables to match the updated folder name.

C:\Program Files\Java\jre1.8.0_181\bin\server

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