public string FullPath
{
get { return Path.Combine(Path.GetDirectoryName(m_container.SolutionFullPath), m_relativePath); }
}
in some cases, member variable m_container is null.
that's the reason why ArgumentNullException is thrown, when it refers to the m_containers.SolutionFullPath.
Even FullPath is not working, RelativePath returns a valid value.
Maybe you can reconstruct a right value of FullPath using the value of RelativePath.
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