Fatal error tcpdf

Hello,
In running some tests to get OSservices booking up and running, I encountered the following error:
Offline Payment
Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 65552 bytes) in /home/xxxxxxxx.com/public_html/components/com_osservicesbooking/tcpdf/tcpdf.php on line 21528

Can you advise please?
Many thanks, Helen

Hi Helen,
The cause of this issue is value of PHP variable: memory_limit is too small, it isn't enough for PDF export feature. You need to increase value of that PHP variable to make the PDF export function to work properly.
Thanks
Dam