claude-code - 💡(How to fix) Fix [Bug] Ultraplan stuck in loading loop, reconnection fails [1 participants]

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/ltl/.local/share/claude/versions/2.1.104 (expected in multi-process scenarios)\n at Tc_ (/$bunfs/root/src/entrypoints/cli.js:2836:2153)\n at Se6 (/$bunfs/root/src/entrypoints/cli.js:2836:1233)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-04-12T18:07:44.017Z"}]

TL;DR

The issue may be resolved by checking the lock file at /Users/ltl/.local/share/claude/versions/2.1.104 and removing it if necessary.

Guidance

• The error message suggests a lock acquisition failure, which could be due to a stale lock file, so checking the file system for the mentioned path is a good starting point.
• Verify if the lock file exists and if it's causing the issue by temporarily removing it and then attempting to reconnect.
• The fact that it's a non-fatal error and the system is designed for multi-process scenarios implies that manual intervention might resolve the issue.
• Consider checking for any other processes that might be holding onto the lock file, preventing Ultraplan from acquiring it.

Example

No specific code snippet can be provided without more context, but the error points to a specific line in cli.js which might be worth investigating for more details on lock handling.

Notes

This approach assumes that the lock file is the cause of the issue. If removing the lock file does not resolve the problem, further investigation into the cli.js file and the locking mechanism used by Ultraplan might be necessary.

Recommendation

Apply workaround: Removing the lock file and checking for other processes holding the lock seems like the most straightforward approach given the information provided, as it directly addresses the error message's indication of a lock acquisition failure.