When trying to select a delivery method in the bpost module for PrestaShop, the following error message appears on a blank page:
It might also be caused by the “Smarty” settings in PrestaShop.
In PrestaShop backend, go to Advanced Parameters – Performance to check the Smarty settings
The setting should be set to “Recompile templates if the files have been updated”
And NOT to “Never recompile template files” as this can create bugs after updates.