Hello I have upgrade magento version from Magento235 to Magento242 now if i am trying to save product attributes from Stores->attributes->product than it shows Validate class not found from basename 'StringLength' error.
You can add this in your
include_path = ".:/yourpathtomagento/vendor/magento/zendframework1/library"
Add your Magento Root directory path where I have mentioned yourpathtomagento in the above path and then check.
- Note: Go to your console and move into your Magento installation
directory and then run
PWDcommand there and copy the whole path and paste there instead of this text
Hope this will help you!