Dolibarr/dolibarr · error

Error: Parameter "generator" or "encoding" not defined

Error message

Error: Parameter "generator" or "encoding" not defined

What it means

When modulepart is 'barcode', viewimage.php requires the GET parameters 'generator' (barcode generator class) and 'encoding' (barcode type) to both be non-empty; one or both are missing, so no barcode image can be produced and the request is aborted.

Solutions

1. Add the missing generator parameter (e.g. generator=camel of the barcode generator class) to the URL
2. Add the missing encoding parameter (e.g. encoding=EAN13, C128, QRCODE) to the URL
3. Fix the code/template that builds the barcode image URL so both parameters are always supplied
4. If using the vcffile path, ensure the preceding logic that derives generator/encoding from the vcard ran correctly

When it happens

Trigger: Thrown at htdocs/viewimage.php:390 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of Dolibarr/dolibarr@598aa4bdad (2026-09-14). Data as JSON: /api/errors/7dd04849f767f21f. Report an issue: GitHub.

Appendix: source

Thrown at htdocs/viewimage.php:390

		$code = '';
		if ($vcffile && $id) {
			// Case of use of viewimage to get the barcode for user pubic profile,
			// we must check the securekey that protet against forging url
			if ($reg[1] == 'user' && (int) $reg[2] > 0) {
				$encodedsecurekey = dol_hash($conf->file->instance_unique_id.'uservirtualcard'.$id.'-'.$login, 'md5');
				if ($encodedsecurekey != GETPOST('securekey')) {
					$code = 'badvalueforsecurekey';
				}
			}
			if (empty($code)) {
				$code = file_get_contents($vcffile);
			}
		}
	}


	if (empty($generator) || empty($encoding)) {
		print 'Error: Parameter "generator" or "encoding" not defined';
		exit;
	}

	$dirbarcode = array_merge(array("/core/modules/barcode/doc/"), $conf->modules_parts['barcode']);

	$result = 0;

	foreach ($dirbarcode as $reldir) {
		$dir = dol_buildpath($reldir, 0);
		$newdir = dol_osencode($dir);

		// Check if directory exists (we do not use dol_is_dir to avoid loading files.lib.php)
		if (!is_dir($newdir)) {
			continue;
		}

		$result = @include_once $newdir.$generator.'.modules.php';
		if ($result) {

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