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Hello,The tutorial is a bit outdated and it does not include the new OpenFOAM export features. Basically your error message means that you have specified a boundary type (most likely "patch") which hasn't been defined properly. It can be defined in the "Boundary Types" tab of the "edit boundary conditions" window. Alternatively you can export just the mesh; even with the combined export the mesh probably exported alright, despite the error message you got.If you have further problems we can try to answer them tomorrow -- there is nobody in the office at the moment.Regards,Oliver