Providing different fonts for the pdf files requires to install font files with the visForms installation. These font files are really big and made the visForms installation file a very big file. Therefore I decided to not include the PDF font files directly into the installation zip file, but during the installation/update of visForms there runs some code, that should stream the font files from our server and install the files on your web server.
If you have this error message, then this process was not successfull for an unknown reason on your website and now the font files are missing.
You can check. If you do not have a file "helvetica.php" in the folder media\com_visforms\tcpdf\fonts then installing the pdf fonts was not successful.
If so, please try the following:
- Download : vi-solutions.de/images/pdfs/pdffonts.zip
- Unzip the downloaded file
- Copy the content of the folder "fonts" inside the extracted folder into the folder media\com_visforms\tcpdf\fonts on your server.