How to fix Power Automate desktop flow NoCandidateMachine error
Decode the NoCandidateMachine sub-error codes and fix the session or machine state blocking your desktop flow, with the 12-hour queue timeout explained.
Topic
Troubleshooting
Error-fixing (combine with How To)
Fix UiPath Studio 2026.0.196 "workflow missing" XAML errors
Studio 2026.0.196 flags present XAML files as missing after the update. Here's the cache-clear fix and the patched build that ends it.
Fix the n8n DeepSeek reasoning_content 400 Error
The DeepSeek AI Agent 400 is a field n8n drops between turns - here are three confirmed workarounds while issue #29119 stays open.
Fix n8n MCP AI Agent OAuth2 Silent Tool Failure
The AI Agent says it used no tools and the run shows success - the real cause is an OAuth2 token n8n never refreshes in an MCP context.
Fix the Zapier Tables Cannot Create ULID 400 Error
The 400 'Cannot create ULID from string' error is a field-mapping mistake, not a broken table - here is how to feed Zapier Tables a valid Record ID.
Fix n8n's MCP Webhook Heap Leak in Queue Mode
Why memory climbs to an OOM crash on n8n workers running an MCP Trigger in queue mode, and the exact version that fixes the SessionManager leak.
How to fix Make's Retry error handler (formerly Break) not triggering
Make's Retry error handler (formerly Break) silently skips HTTP module failures until you flip one toggle on the HTTP module itself.
How to Fix LangChain AgentExecutor Not Calling Tools
AgentExecutor's verbose trace shows it choosing a tool, then the chain just finishes - no error, no tool result. Here's why, and the five-check fix.
Fix LangChain create_react_agent 'unexpected keyword argument prompt'
The TypeError comes from a kwarg rename between langgraph versions - or the wrong create_react_agent import entirely. Here's how to tell which and fix it.
How to fix Cursor's Terminal sandbox error on Linux (AppArmor)
Cursor's terminal sandbox fails on Ubuntu 24.04+, Fedora, and Arch because of an AppArmor namespace restriction -- here's the two-command fix and why chmod 4755 makes it worse.