What causes "Failed to load config" in continuedev/continue?

Fix or regenerate config.json (check JSON syntax)

continuedev/continue · error · Error

Failed to load config

Error message

Failed to load config

What it means

The streamDiffLines handler loads config to resolve a model for streaming a diff; if loadConfig returns no config object (parse failure, missing file, or error swallowed into undefined) it throws 'Failed to load config'.

Solutions

Fix or regenerate config.json (check JSON syntax)
Check that loadConfig errors are surfaced, not silently returning undefined
Restore a known-good config backup

Defensive patterns

Strategy: validation

Validate before calling

const { config, error } = await configHandler.loadConfig();
if (!config) { surface(error ?? 'config.json missing/invalid'); return; }

Type guard

const isConfig = (c: unknown): c is Config => !!c && typeof c === 'object' && 'modelsByRole' in c;

Try / catch

catch (e) { if (e.message === 'Failed to load config') { revalidateConfigFile(); } }

Prevention

Validate config.json (JSON.parse + schema) at startup
Back up config before migrations

When it happens

Trigger: Requesting streamDiffLines when config.json is missing, unparsable, or loadConfig returned an error result with config undefined.

Common situations: Corrupted or hand-edited config.json; deleted config directory; schema change after upgrade invalidating old config.

Related errors

AI-assisted analysis of continuedev/continue@5522c6f44c (2026-08-27). Data as JSON: /api/errors/1c5cf46c4ba0acec. Report an issue: GitHub.

Appendix: source

Thrown at core/core.ts:743

    on("nextEdit/queue/clear", async (msg) => {
      console.log("nextEdit/queue/clear");
      const queue = PrefetchQueue.getInstance();
      queue.clear();
      return;
    });

    on("nextEdit/queue/abort", async (msg) => {
      console.log("nextEdit/queue/abort");
      const queue = PrefetchQueue.getInstance();
      queue.abort();
      return;
    });

    on("streamDiffLines", async (msg) => {
      const { config } = await this.configHandler.loadConfig();
      if (!config) {
        throw new Error("Failed to load config");
      }

      const { data } = msg;

      // Title can be an edit, chat, or apply model
      // Fall back to chat
      const llm =
        config.modelsByRole.edit.find((m) => m.title === data.modelTitle) ??
        config.modelsByRole.apply.find((m) => m.title === data.modelTitle) ??
        config.modelsByRole.chat.find((m) => m.title === data.modelTitle) ??
        config.selectedModelByRole.chat;

      if (!llm) {
        throw new Error("No model selected");
      }

      const abortManager = ApplyAbortManager.getInstance();
      const abortController = abortManager.get(

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