Have you tried the method suggested by Ralph a few posts below for all projects that are defining and using an entities model? If you have missed a single project that could lead to the exception you are experiencing. Also make sure to restart Visual Studio after the "Upgrade References"
process is done and then rebuild the whole solution.
If all these steps do not help, please give us more details about the original version of Telerik Data Access that you were using previously, the method of referencing our assemblies in your project (were you using the simple references and the default targets file or you were using the No Installation method
Regards and Happy New year,
OpenAccess ORM is now Telerik Data Access
. For more information on the new names, please, check out the Telerik Product Map