ERROR: typeTree.m_Children.front ().m_Type != SerializeTraits::GetTypeString (NULL)
解决方法:
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Enable source control on your project: Edit/Project Settings/Editor/Visible Meta Files (This will create meta files for every asset you have, these fiels contain information such as how the asset should be imported as well as a unique guid so you should not lose links to scripts etc)
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Create a new project with unity 4.2.2. Keep the project empty. Enable source control on this project like you did with the other.
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Now replace the "Assets" folder from your 4.2.2 project with the 4.3 project Assets folder.
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Unity 4.2.2 should import all the assets with the correct settings and you should have a 4.2.2 project again. You can now disable source control and it will remove the meta files.