We have the free version of your plugin to do inscriptions. This formulary is open since 13februrary and the pdf was produced succefully.
But since two or three days, when we want download pdf this message appears:
There was an error generating the PDF file.
This activation code is not valid.
I disabled, and enabled, I uninstalled and reinstalled the plugins, but the message is always present.
We don’t have other formulary used to work with formidablepro2pdf