DVT VHDL IDE User Guide
Rev. 19.1.36, 21 October 2019
An error is triggered when assigning a value to a generic that is not defined in an entity.
Place the editor cursor on the error's line and press Ctrl + 1, select Add generic ... from the list of quick fix proposals and press Enter.
Tip: If the entity is instantiated multiple time across the project, the Refactor Add Generic Wizard is opened. See here.