Did a crtitical update now getting errors My customer clicked the update button and updated number 2.6.2791 

now we are getting errors trying to save new images to the site.

Internal Server Error

Could not resolve the subpath “project-images/{slug}”.

I wonder if this is a permissions thing?

regards

Hugh
Most likely you've got an Assets field inside of a Matrix field somewhere on your site and you're referencing project-images/{slug} in that field's upload location setting when it should be project-images/{owner.slug}.

At some point, those settings were more loosely enforce, but now the error you're getting will be shown if it is incorrect.

See here for more info: https://craftcms.com/docs/assets-fields#dynamic-subfolder-paths