Tiling images is a long process when images are many and big. So if you enable autotiling before existing images are tiled, it will slow the server too much (except if you have a good one). So the process is to run the job to create all tiles just below, then to enable the option to avoid to create tiles manually for next import.
But I think your issue is different, since it’s only a warning, not an error. Is there a reason you keep old versions of Omeka ?
Thank you for your reply.
I am currently waiting for the technical department to upgrade to Omeka.
Do you think by upgrading Omeka the situation can be resolved? Because in this moment I can’t enable to auto tiling.