projectdiscovery/nuclei · error

expected 1 package, got %d

Error message

expected 1 package, got %d

What it means

parsePackageDir returned more than one package for the directory passed to CreateTemplateData, but bindgen processes exactly one module package at a time. Multiple package clauses (or package variants behind build tags) in the same directory trigger it.

Source

Thrown at pkg/js/devtools/bindgen/generator.go:129

	}
	return modules, nil
}

// CreateTemplateData creates a TemplateData structure from a directory
// of go source code.
func CreateTemplateData(directory string, packagePrefix string) (*TemplateData, error) {
	fmt.Println(directory)
	fset := token.NewFileSet()

	pkgs, err := parsePackageDir(fset, directory)
	if err != nil {
		return nil, errors.Wrap(err, "could not parse directory")
	}
	if len(pkgs) == 0 {
		return nil, errors.New("no packages found")
	}
	if len(pkgs) != 1 {
		return nil, fmt.Errorf("expected 1 package, got %d", len(pkgs))
	}

	config := &types.Config{
		Importer: importer.ForCompiler(fset, "source", nil),
	}
	var packageName string
	var pkgMain *parsedPackage
	var files []*ast.File
	for name, pkg := range pkgs {
		packageName = name
		pkgMain = pkg
		break
	}
	filenames := make([]string, 0, len(pkgMain.files))
	for filename := range pkgMain.files {
		filenames = append(filenames, filename)
	}
	sort.Strings(filenames)

View on GitHub (pinned to 265b3a3dec)

Solutions

1. Run grep -h '^package ' <dir>/*.go | sort -u — it must yield exactly one name
2. Fix or move offending files so the directory holds a single package
3. Re-run bindgen / make devtools-all

Example fix

# before: dir contains package smb and package smbhelper
# after: all files in dir declare: package smb

out, err := exec.Command("sh", "-c", "grep -h '^package ' "+dir+"/*.go | sort -u").Output()
if err != nil || strings.Count(strings.TrimSpace(string(out)), "\n") != 0 {
    log.Fatalf("directory must contain exactly one package: %s", out)
}

Catch the error from CreateTemplateData; when the wrapped text says 'expected 1 package', stop and reconcile package clauses in the directory rather than retrying.

When it happens

Trigger: A directory under pkg/js/libs containing files with two different package names (e.g. package smb and package smbutil), or generated/abandoned files from a rename that kept the old package clause.

Common situations: Copy-pasting a new lib file and forgetting to update its package line; leftovers after renaming a module; adding an 'internal' helper file with a different package name into the module dir.

Related errors

• could not create template data: %v
• could not write go template: %v
• could not create entity parser: %s
• could not parse entities: %s
• could not scrape and create new object: %s

AI-assisted analysis of projectdiscovery/nuclei@265b3a3dec (2026-08-15). Data as JSON: /api/errors/6b8f83ec0ed5b81c. Report an issue: GitHub.