If you’re running a simulation for your schematic on Proteus and you encounter an error “No model specified” for any component, you can solve it by editing the component manually.
Here are the steps on how you can edit the component:
On the Schematic Capture tab, double-click the component.
2. An “Edit Component” tab will pop out.
3. Check the box “Attach hierarchy module” and click OK.
4. Rerun the simulation button and notice the error has gone.