The Model Check toolbar allows you to quickly run the Check Model tool. The types of checks that are conducted are specific to entity types. Check Model detects errors such as negative mass for a body and negative diameter for a beam.

Model Check toolbar

Left-click the corresponding button on the toolbar to search for unresolved references and invalid data in the model.  If errors in the model are detected, it is reported in the message window that is displayed when the check is completed.