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Fatal error: Uncaught TypeError: Argument 1 passed to Picqer\Barcode\BarcodeGenerator::getBarcodeData() must be of the type string, null given, called in /srv/_container/_1000293/web/content/code128/vendor/picqer/php-barcode-generator/src/BarcodeGeneratorPNG.php on line 54 and defined in /srv/_container/_1000293/web/content/code128/vendor/picqer/php-barcode-generator/src/BarcodeGenerator.php:97 Stack trace: #0 /srv/_container/_1000293/web/content/code128/vendor/picqer/php-barcode-generator/src/BarcodeGeneratorPNG.php(54): Picqer\Barcode\BarcodeGenerator->getBarcodeData(NULL, 'C128') #1 /srv/_container/_1000293/web/content/code128/index.php(15): Picqer\Barcode\BarcodeGeneratorPNG->getBarcode(NULL, 'C128', 6, 100) #2 {main} thrown in /srv/_container/_1000293/web/content/code128/vendor/picqer/php-barcode-generator/src/BarcodeGenerator.php on line 97