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startup error · Issue #1569 · processing/processing4 · GitHub
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startup error #1569

Description

@Miuren

After installing the new version of Processing 4-5-6 on Windows 11 pro, this screen appears

errore proc-4.pdf

I tried uninstalling and reinstalling the program but the error message keeps appearing.

what should I do?

Activity

  1. SableRaf commented on Sep 14, 2026

    @SableRaf
    Collaborator

    @Miuren The pdf link doesn't seem to work. Please edit your issue and include the image directly in the body of the issue. If possible please also describe the issue and your version of Windows.

  2. Miuren commented on Sep 14, 2026

    @Miuren
    Author

    L'app parte e dopo qualche seconda appare l'errore:

    Image

    il sistema è windows 11 pro
    processore AMD Ryzen 9 6900 HX
    Build di Windows: 26200
    Processori: 16
    Velocità processore: 3294 MHz
    Memoria: 32035 MB
    Piattaforma: 64 Bit

    errore proc-4.pdf

  3. Miuren commented on Sep 15, 2026

    @Miuren
    Author

    Solved.
    I opened preference.txt with a text editor, searched for strings starting with instance_server.port= (and, if present, instance_server.key=), and deleted them.
    After restarting the app, the error disappeared and it works properly.
    Thanks for your support.

  4. SableRaf commented on Sep 15, 2026

    @SableRaf
    Collaborator

    Thanks for following up @Miuren do you happen to have a copy of the old preference.txt? It could help maintainers diagnose the issue and make a more robust fix.

  5. Miuren commented on Sep 15, 2026

    @Miuren
    Author
  6. catilac commented on Sep 16, 2026

    @catilac
    Collaborator

    @Miuren this should be fixed in the upcoming release candidate, would you be able to try this? https://github.com/processing/processing4/releases/tag/processing-1435-4.5.7-rc

  7. catilac commented on Sep 16, 2026

    @catilac
    Collaborator

    this should be fixed by #1570

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