Export for mouselines

This issue is kind of a follow up to #3 (closed)

The Mouseline catalogue does have an "Export as PDF" button, however it generates an error and no valid PDF file is obtained. Is this simply a bug, or is the button still a placeholder of some sort?
Example of a non functional pdf export: mouseline-datasheet-1.pdf which contains the following text:
Deprecated: Array and string offset access syntax with curly braces is deprecated in /var/www/html/production/sites/all/modules/sfb-commons/lib/tcpdf_min_6.2.12/tcpdf.php on line 16893

Deprecated: Array and string offset access syntax with curly braces is deprecated in /var/www/html/production/sites/all/modules/sfb-commons/lib/tcpdf_min_6.2.12/tcpdf.php on line 16893

Deprecated: Array and string offset access syntax with curly braces is deprecated in /var/www/html/production/sites/all/modules/sfb-commons/lib/tcpdf_min_6.2.12/tcpdf.php on line 16896

Warning: "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"? in /var/www/html/production/sites/all/modules/sfb-commons/lib/tcpdf_min_6.2.12/tcpdf.php on line 17778

Deprecated: Array and string offset access syntax with curly braces is deprecated in /var/www/html/production/sites/all/modules/sfb-commons/lib/tcpdf_min_6.2.12/include/tcpdf_images.php on line 318
TCPDF ERROR: Some data has already been output, can't send PDF file