Having persistent types in one of your assemblies requires that they are enhanced during compile time by one of our tools. This tool (enhancer) is version specific and as such you can only enhance projects built against the same version as the enhancer itself. Can you please check in your project file to which version of the openaccess targets are you referring. It seems that you are referencing assemblies from our q3 2010 release but you are using the enhancer from q3 2008.
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