OS: Windows 10, Windows 11
🙄 We recently had a following support case.
A customer couldn't use the Designer anymore because our internal browser and the process editor didn't work as desired. Restarting and even reinstalling the Designer did not help.
🤔 So, what was the cause?
The WebView2 installation no longer worked as it should, and other applications that use WebView2 no longer worked either. And also an error message in the Designer log indicated WebView2 as the trouble maker.
!ENTRY org.eclipse.e4.ui.workbench 4 0 2025-04-29 11:55:48.574
!MESSAGE No more handles [0x8007139f]
!STACK 0
org.eclipse.swt.SWTError: No more handles [0x8007139f]
at org.eclipse.swt.SWT.error(SWT.java:4952)
at org.eclipse.swt.browser.Edge.error(Edge.java:225)
at org.eclipse.swt.browser.Edge.setupBrowser(Edge.java:600)
at org.eclipse.swt.browser.Edge.lambda$10(Edge.java:580)
😎 How we fixed it?
We tried to reinstall WebView2, but this isn't so easy anymore, because Windows has listed WebView2 as a System-component and this hide the possibility to reinstall WebView2 at runtime...
anyway try it first: search for WebView2 via “Control Panel > Programs > Programs and Features” and if its listed: do a reinstall it via “repair”.
if you can't find WebView2, go to your registry and change the following entry to 0, so that WebView2 is no longer listed as a system component and try step1 again.
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Microsoft EdgeWebView]
"SystemComponent"=dword:00000001
When you're done, the Designer should work like before and it might be a good idea to revert the registry entry. 😉
Here is further information about the registry change
