Hi,

Th issue might be because, its a very large report that you are trying to print, so try to print it with less data.

There are some limitations for Wkhtml2pdf library, that consumes large memory on printing huge report with several pages. And there are some fixes for this issue, by modifying memory usage limits etc.

You can get more info from here:

https://github.com/odoo/odoo/issues/2722