Unable to access Hikashop after adding extra field

-- url of the page with the problem -- : localhost
-- HikaShop version -- : 2.6.0
-- Joomla version -- : 3.4.4
-- Error-message(debug-mod must be tuned on) -- : 1017 Can't find file: 'ukh16_hikashop_product' (errno: 2 - No such file or directory) SQL=SELECT *, SUM(order_product_quantity) as Total FROM ukh16_hikashop_order as a LEFT JOIN ukh16_hikashop_order_product as prod ON a.order_id=prod.order_id LEFT JOIN ukh16_hikashop_product AS p ON p.product_id=prod.product_id LEFT JOIN ukh16_hikashop_product_category as cat ON cat.product_id=p.product_id OR cat.product_id=p.product_parent_id LEFT JOIN ukh16_hikashop_category as c ON cat.category_id=c.category_id WHERE a.order_created > 1445231708 AND a.order_created

I have been building my database in Hikashop happily when I went to add a new (I have about 15 already) custom product field. The system threw an error (sorry, didn't catch it), didn't save the field and then wouldn't let me into Hikashop. Through phpmyadmin I get a similar message

#1017 - Can't find file: 'ukh16_hikashop_product' (errno: 2 - No such file or directory)

Thank you. This was my fear. I can't be sure why this has happened but the only thing that occurred to me was that I had changed a number of tick-box options to radio-button options whilst the database still had products with the custom field in. Not sure if that might cause an issue.

For me it is 2 hours work to fresh build to where I am and I think that is the most sensible option this early on with a build.

Sorry if I made it sound like an accusation, it was not. I was just mooting some possibilities. My suspicion points to a file sync happening at the same moment, on my computer, that I committed a change to the database at an earlier point.

I have performed a database repair and optimise through Akeeba Admin Tools but would be interested in your link....sadly the resource does not exist any more.

If you can find another resource on the methodology that you are suggesting then I would be really pleased to try it. However I will be starting again on Wednesday and will take Akeeba Backup's regularly as I repeat the steps so I have a number of positions to restore to.

Thanks.