Troubleshooting

​

Solution

rm -rf ~/.npm/_npx

​

Why This Happens

​

Solution by Client

# macOS/Linux
mkdir -p ~/.cursor && touch ~/.cursor/mcp.json

# Windows (PowerShell)
New-Item -ItemType Directory -Force -Path "$env:APPDATA\Cursor"
New-Item -ItemType File -Force -Path "$env:APPDATA\Cursor\mcp.json"

# macOS
mkdir -p ~/Library/Application\ Support/Claude
touch ~/Library/Application\ Support/Claude/claude_desktop_config.json

# Linux
mkdir -p ~/.config/Claude
touch ~/.config/Claude/claude_desktop_config.json

# Windows (PowerShell)
New-Item -ItemType Directory -Force -Path "$env:APPDATA\Claude"
New-Item -ItemType File -Force -Path "$env:APPDATA\Claude\claude_desktop_config.json"

​

Solution Steps

1. Verify Configuration
   • Check that your mcp.json or config file has valid JSON syntax
   • Ensure all credentials are correctly formatted
   • Verify there are no trailing commas or syntax errors
2. Check Node.js Installation
   Copy

   node --version
   

   You should see version 16 or higher. If not, download Node.js.
3. Restart Your Client
   • Completely quit your AI agent (don’t just close the window)
   • Clear the npx cache: rm -rf ~/.npm/_npx
   • Restart the application
4. Check Logs
   • Cursor: Check the Developer Console (Help → Toggle Developer Tools)
   • Claude Desktop: Look for error messages in the app
5. Test Connection Ask your AI agent: “Can you run a health check on n8n?” If configured correctly, it should attempt to connect.

​

Solution

1. Verify Synta API Key
   • Ensure you copied the full API key from synta.io/mcp
   • Check for extra spaces or newlines
   • Make sure the key starts with the correct format
2. Check N8N Credentials
   • Verify your N8N instance URL is accessible
   • Test your N8N API key in a browser or API client
   • Ensure the API key has the correct permissions
3. Update Configuration
   • Replace credentials in your config file
   • Restart your AI agent after updating

​

Solution

1. Check Internet Connection
   • Ensure you have a stable internet connection
   • Try accessing the MCP server URL in a browser
2. Firewall/Proxy Settings
   • Check if your firewall is blocking the connection
   • If using a corporate proxy, ensure npx can access external URLs
   • You may need to configure proxy settings in your environment
3. N8N Instance Accessibility
   • Verify your N8N instance is running and accessible
   • Test the URL in a browser: https://your-instance/api/v1/health
   • Check if the instance requires VPN or special network access

​

Solution

1. Slow Down Requests
   • Give your AI agent more time between operations
   • Process workflows in smaller batches
2. Check Your Plan
   • Verify your Synta MCP plan limits at synta.io/mcp
   • Consider upgrading if you need higher limits
3. Optimize Tool Usage
   • Use get_node_essentials instead of get_node_info when possible
   • Use validate_node_minimal for quick checks instead of full validation

​

Solution

1. Check N8N Version Compatibility
   • Synta MCP is optimized for specific N8N versions
   • Ensure your N8N instance is up to date
   • Some node properties may differ between versions
2. Use Autofix
   • Try n8n_autofix_workflow to automatically resolve common issues
   • Review the suggested fixes before applying
3. Validate Incrementally
   • Validate individual nodes with validate_node_operation
   • Build workflows step by step, validating each addition
4. Review Error Messages
   • Validation errors include specific property paths
   • Check the node documentation for required properties