Error handler must not already be registered: blockDiagram

Answers (1)

Hi Laura,
This error message indicates that there's a problem with registering a block diagram or a handler within your Simulink model. Here are some workarounds to resolve this error:
  1. Check for Duplicate Block Diagrams - Make sure that you don't have multiple instances of the same block diagram within your Simulink model. Duplicate block diagrams can lead to this error.
  2. Review Block Diagram Registration - Check your model's initialization code or any custom scripts you've written to register block diagrams or handlers.
  3. Clear Simulink cache and restart Simulink.

Asked:

on 22 Oct 2022

Answered:

on 6 Sep 2023

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