emberjs/ember.js · error · Error

Unexpected missing () in call head

Error message

Unexpected missing () in call head

What it means

Error "Unexpected missing () in call head" thrown in emberjs/ember.js.

Source

Thrown at packages/@glimmer/compiler/lib/builder/builder-interface.ts:340

    }
  }
}

function extractBlockHead(name: string): NormalizedHead {
  const result = /^(#|!)(.*)$/u.exec(name);

  if (result === null) {
    throw new Error(`Unexpected missing # in block head`);
  }

  return normalizeDottedPath(result[2] as string);
}

function normalizeCallHead(name: string): NormalizedHead {
  const result = /^\((.*)\)$/u.exec(name);

  if (result === null) {
    throw new Error(`Unexpected missing () in call head`);
  }

  return normalizeDottedPath(result[1] as string);
}

function normalizePath(head: string, tail: string[] = []): NormalizedHead {
  const pathHead = normalizePathHead(head);

  if (isPresentArray(tail)) {
    return {
      type: GET_PATH_EXPR,
      path: {
        head: pathHead,
        tail,
      },
    };
  } else {
    return {

View on GitHub (pinned to 26f97246a8)

When it happens

Trigger: Thrown at packages/@glimmer/compiler/lib/builder/builder-interface.ts:340 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of emberjs/ember.js@26f97246a8 (2026-09-01). Data as JSON: /api/errors/c665f2e42796a9a6. Report an issue: GitHub.