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'.

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(

View on GitHub (pinned to 5522c6f44c)

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.