claude-code - 💡(How to fix) Fix [Bug] MCP server configuration file not found: mcp.json missing [1 comments, 2 participants]

[{"error":"SyntaxError: JSON Parse error: Unable to parse JSON string\n at <parse> (:0)\n at parse (unknown)\n at i9q (/$bunfs/root/src/entrypoints/cli.js:171:10030)\n at O (/$bunfs/root/src/entrypoints/cli.js:131:19234)\n at <anonymous> (/$bunfs/root/src/entrypoints/cli.js:173:1422)\n at MUH (/$bunfs/root/src/entrypoints/cli.js:2769:37239)\n at EP (/$bunfs/root/src/entrypoints/cli.js:2769:32682)\n at JGH (/$bunfs/root/src/entrypoints/cli.js:2769:34305)\n at <anonymous> (/$bunfs/root/src/entrypoints/cli.js:18816:1304)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-05-04T03:44:49.400Z"},{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/aiko/.local/share/claude/versions/2.1.126 (expected in multi-process scenarios)\n at r86 (/$bunfs/root/src/entrypoints/cli.js:2768:2177)\n at HD8 (/$bunfs/root/src/entrypoints/cli.js:2768:1257)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-05-04T03:44:49.420Z"},{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server unifi-network invalid: Missing environment variables: UNIFI_NETWORK_HOST, UNIFI_NETWORK_USERNAME, UNIFI_NETWORK_PASSWORD\n at JGH (/$bunfs/root/src/entrypoints/cli.js:2769:34881)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-05-04T03:44:49.451Z"},{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server unifi-network invalid: Missing environment variables: UNIFI_NETWORK_HOST, UNIFI_NETWORK_USERNAME, UNIFI_NETWORK_PASSWORD\n at JGH (/$bunfs/root/src/entrypoints/cli.js:2769:34881)\n at async k (/$bunfs/root/src/entrypoints/cli.js:6355:11810)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-05-04T03:44:50.414Z"},{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server unifi-network invalid: Missing environment variables: UNIFI_NETWORK_HOST, UNIFI_NETWORK_USERNAME, UNIFI_NETWORK_PASSWORD\n at JGH (/$bunfs/root/src/entrypoints/cli.js:2769:34881)\n at async V (/$bunfs/root/src/entrypoints/cli.js:6355:12696)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-05-04T03:44:50.414Z"}]

TL;DR

The issue is likely due to a missing mcp.json file and unresolved environment variables for Unifi Network, which can be fixed by creating the necessary configuration file and setting the required environment variables.

Guidance

• Check if the mcp.json file exists in the expected location and create it if necessary.
• Set the environment variables UNIFI_NETWORK_HOST, UNIFI_NETWORK_USERNAME, and UNIFI_NETWORK_PASSWORD to resolve the Unifi Network configuration issue.
• Verify that the mcp.json file is correctly formatted and contains the necessary configuration for the Unifi Network plugin.
• Review the error messages to ensure that all required environment variables are set and the configuration file is accurate.

Example

No code snippet is provided as the issue is related to configuration and environment variables.

Notes

The issue seems to be related to a missing configuration file and unresolved environment variables. Resolving these issues should fix the problem, but further investigation may be required if the issue persists.

Recommendation

Apply workaround by creating the mcp.json file and setting the required environment variables, as this should resolve the immediate issue and allow for further troubleshooting if necessary.