If when you upload a solution to the solution gallery in SharePoint 2010 you receive the following error.
“This solution contains invalid markup or elements that cannot be deployed as part of a sandboxed solution. Solution manifest for solution ’64afe4f8-6a99-42e8-9845-43fc18cc49f8′ failed validation, file manifest.xml, line 10, character 4: The element ‘Solution’ in namespace ‘http://schemas.microsoft.com/sharepoint/’ has invalid child element ‘TemplateFiles’ in namespace ‘http://schemas.microsoft.com/sharepoint/’. List of possible elements expected: ‘FeatureManifests, ActivationDependencies’ in namespace ‘http://schemas.microsoft.com/sharepoint/’.
This is probably caused by the fact that there are some features or functionality referenced by the solution, which are not supported in sandboxed environment. Such as the following
- Custom Action groups
- HideCustomAction element
- Content Type Binding
- Web Application-scoped Features
- Farm-scoped Features
- CustomPropertyToolPart Class
- Programmatic workflow
- Event receivers
- timer jobs
- visual WebParts
- SharePoint mapped folders (e.g. “_layouts”, and “images”)
menu.
http://technet.microsoft.com/en-us/library/cc262995(office.14).aspx
