dagger/dagger · error

failed to load module dependencies: %w

Error message

failed to load module dependencies: %w

What it means

The errgroup Wait after concurrently selecting `asModule` on each toolchain source failed; the wrapped error is whichever per-toolchain load failed (arg building via BuildLegacyAsModuleArgs or the dagql select itself). This is an aggregate wrapper — the real cause is inside.

Source

Thrown at core/schema/modulesource.go:4364

				nameOverride,
				false, // related modules never set LegacyDefaultPath (see pendingRelatedModule)
				dpRef,
				dpPin,
				configDefaults,
				false, // DefaultsFromDotEnv is not set for related modules
				argCustomizations,
			)
			if err != nil {
				return fmt.Errorf("build toolchain asModule args: %w", err)
			}
			return dag.Select(ctx, tcSrc, &tcMods[i],
				dagql.Selector{Field: "asModule", Args: toolchainAsModuleArgs},
			)
		})
	}

	if err := eg.Wait(); err != nil {
		return nil, fmt.Errorf("failed to load module dependencies: %w", err)
	}

	deps, err := s.loadDefaultSchemaBuilder(ctx, src)
	if err != nil {
		return nil, err
	}
	for _, depMod := range depMods {
		deps = deps.Append(core.NewUserMod(depMod))
	}

	return deps, nil
}

// loadDefaultSchemaBuilder returns a SchemaBuilder seeded with only the default
// (core) dependencies, with the core module pinned to src's engine version
// view. Callers append the user modules they want to expose.
func (s *moduleSourceSchema) loadDefaultSchemaBuilder(
	ctx context.Context,

View on GitHub (pinned to 82ba2681db)

Solutions

1. Look at the wrapped underlying error to identify the failing toolchain
2. Verify each toolchain/related module source is loadable as a module
3. Retry after fixing the failing dependency's source/config

When it happens

Trigger: Thrown at core/schema/modulesource.go:4364 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of dagger/dagger@82ba2681db (2026-09-05). Data as JSON: /api/errors/029257e9ddcd4c9c. Report an issue: GitHub.