PDF generation failed. The package mPDF is not installed. You can install it using packages. This is set by the administrator (search for "print" in the control panels to locate the setting).
On this #tikiexpresstutorial, using #tiki19 I’ll show you:
How to enable a feature from the Control Panels
How to enable a Global Feature from the features panel
How to enable an Interface feature
A quick overview of the Programmer features
And where to look for feature options