Handle 0 is invalid

james — Tue, 28 Oct 2025 11:26:18 -0000

Hello,
I am rather new to Codesys, final year engineering apprentice.
I am trying to get good grip of Codesys to implent it in my company.

Here is what i am using:
Windows 11
Codesys V3.5 Patch 1
Raspberry Pi 5 with visualization.

Problem: Nothing happens when i try to switch to Codesys perspective, the view stays in HMI project.

This is an issue because me and my colleagues all use the Codesys perspective and is more intuitive to us and we are still learning to use use the application.
I have tried looking on the blogs but i can't find any that have solved this issue.

There is also a message that started to appear at the same time as this problem (The project handle 0 is invalid).
Error appears when want to switch to a different project or when i try to close it.
When I close the message, i can no longer close my current project so i have to close Codesys to open a new project.

Any thoughts??

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Handle 0 is invalid