[BUG] Error loading webview: Error: Could not register service worker: InvalidStateError: Failed to register a ServiceWorker: The document is in an invalid state..

I hit this issue as well on Linux, vscode 1.106.1, claude code extension v2.1.52 (and I tried installing a couple previous versions with no success).

I hit this issue with:

• macOS 26.3
• Claude Code VSCode extension 2.1.71
• VSCode 1.110.0

Today is the first time I experience this issue.

Note: I will try to debug this a bit more because this is not a Claude-only issue, as another extensions that use the same approach (sidebar), have the same issue.

I am hitting this issue as well on Ubuntu 22.04
Claude Code Vscode 2.1.79
I can't go on the extension

Same issue after an update to VSCode 1.112.0. It worked before the update. Uninstalling and reinstalling the extension doesn't help. Restarting extensions doesn't help. Restarting VSCode doesn't help.

Ubuntu 24.04, VSCode 1.112.0, Claude Code for VSCode 2.1.79, used with Chat for Claude Code 1.1.0 (he error occurs with or without Chat for Claude Code installed)

The following steps did fix the issue:

Clear these directories:

~/.config/Code/Cache
~/.config/Code/CachedData
~/.config/Code/CachedExtensions
~/.config/Code/GPUCache
~/.config/Code/User/workspaceStorage

I was also hitting this on Ubuntu 22.04 (I commented earlier in March). In my case, the root cause turned out to be VSCode being resource-starved rather than corrupted cache. Claude Code helped me diagnose it:

• .vscode/browse.vc.db had grown to 1.3 GB — the C/C++ IntelliSense browse database was indexing every symbol from /usr/include/** and ROS headers because limitSymbolsToIncludedHeaders was set to false
• No files.watcherExclude was configured — VSCode was watching build/, install/, log/, .venv/, and node_modules/ (~470 MB of build artifacts)

Fix

1. Delete .vscode/browse.vc.db (it rebuilds automatically)
2. Set limitSymbolsToIncludedHeaders: true in c_cpp_properties.json
3. Add files.watcherExclude and search.exclude for build artifact directories
4. Set C_Cpp.intelliSenseMemoryLimit: 4096

This may not be the same root cause as what others are seeing, but if you're working in a large C++ workspace (especially ROS) and hitting this error intermittently, it's worth checking whether VSCode is just running out of resources to register the service worker.

Roger's cache-clearing fix is also worth trying if the above doesn't help.

Closing for now — inactive for too long. Please open a new issue if this is still relevant.

I had the same problem. The only thing that worked was updating vscode.

Just happened to me after a failed prompt; while the prompt seemed to work as usual, it was doing nothing. I restarted VSCode and that happened.
I'm on Linux, Nobara.
Deleting ~/.config/Code/CachedExtensions fixed it for me.

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