cannot preview certificate

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  • Thread Starter hafayyad

    (@hafayyad)

    2 years, 4 months ago

    Error Message: strtoupper() expects parameter 1 to be string, array given.

    Error File: /home4/ksadtsmy/public_html/wp-content/plugins/woocommerce-pdf-invoices-packing-slips/vendor/dompdf/dompdf/src/Dompdf.php

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