Failed to load 'Assets/Plugins/xxx.dll' with error '操作成功完成

Failed to load ‘Assets/Plugins/xxx.dll’ with error '操作成功完成。
', GetDllDirectory returned ‘’. If GetDllDirectory returned non empty path, check that you’re using SetDirectoryDll correctly.

uniy3d 5.2.3 Windows 64

I take this is the same question as here please dont double post.