I just found out that the Challan and Forminator PDF Generator Add-on plugins are having a conflict, both of them cant generate a PDF file and returns a error “Cannot write to an undeclared property MpdfMpdf::$cacheCleanupInterval”.
I did a little research what might cause and found out that it might be “Both plugins are using different versions of mPDF.” Forminator PDF Add-on loads newer mPDF while Challan loads older mPDF.
Also both plugins are already on its latest versions and essential to the website I’m working on and I’m wordering if there a way to fix or a workaround for this issue.
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