I have done a basic product import (sku, name, etc) but now when I go to add more details to the product page and then click save I get this error.
I also keep getting this error randomly when clicking buttons, I can't personally work out a pattern to it. (2nd image is behind the pop-up box)
To get the error that time I pressed back on a product page, which replicates the issue each time but isn't the only time it happens.
The database is surely connected because I wouldn't be able to import products without it?
Anyway im at a loss and couldn't find anyone having the same issue as me online.
Any help would be greatly appreciated.
P.S some server info.
Ubuntu 16.04
PHP 7.0.22
MySQL 5.7.21
Another Update:
I have another instance of Magento 2.2.2 running on an i dentical server and it lets me save products fine.


