Magento2: We can't add this item to your shopping cart right now. Magento 2.2.1

[omargits]

Magento 2.2.1 fresh installation with composer and also with zip but having same issue. once you logged in you cant add to cart product.

We can't add this item to your shopping cart right now.
from var/log here is information
[2017-11-09 07:01:51] main.CRITICAL: Validate class not found from basename 'Magento\Framework\Validator\EmailAddress' {"exception":"[object] (Zend_Validate_Exception(code: 0): Validate class not found from basename 'Magento\Framework\Validator\EmailAddress' at /var/customers/webs/magento2/vendor/magento/zendframework1/library/Zend/Validate.php:244)"} []

Preconditions

1. Magento 2.2.1
2. PHP Version
   PHP 7.0.19 (cli) (built: May 15 2017 10:28:51) ( NTS )
   MYSQL
   Server version: 5.6.36

Steps to reproduce

1. Logged in as customer
2. try to add product from product detail page
3. error produce

Expected result

1. must add to cart normally

Actual result

1. [Screenshot, logs]
   https://www.screencast.com/t/lffU7G5TM
   [2017-11-09 07:01:51] main.CRITICAL: Validate class not found from basename 'Magento\Framework\Validator\EmailAddress' {"exception":"[object] (Zend_Validate_Exception(code: 0): Validate class not found from basename 'Magento\Framework\Validator\EmailAddress' at /var/customers/webs/magento2/vendor/magento/zendframework1/library/Zend/Validate.php:244)"} []

[magento-engcom-team]

@omargits, thank you for your report.
We were not able to reproduce this issue by following the steps you provided. If you'd like to update it, please reopen the issue.
We tested the issue on 2.2.1

[omargits]

I installed same version on second server it producing there also with same process. in google there are many links exist which also reporting this issue but that mostly for 2.2. one thing can you guide me so i can detail checking and shared with more detail with you

[fremeni]

Same problem here.

[eleongkind]

Same here

[webmasterpaula]

Same here. Magneto 2.2.2. Please help me.

[EmilyPepperman]

Same here with 1 product not all of them ... do you with the same problem also have MageWorx extension called Advanced Product Options by chance?

[seanscott49]

Well, this is what worked for me. It was an issue with a Third Party Module. Update all of your modules. If it still persists, then disable them one by one until you figure out which one is causing the issue. For me, it was one of my Amasty Modules. Once I updated, all was good.

[bmzero]

I had this same issue on 2.2.5. It was related to an outdated Amasty extension. We weren't using it anyway, so a quick disable of the extension, recompile, and good to go.

[dribblecastle]

Which Amasty module @seanscott49 and @bmzero? I have a few installed and run into this issue every few weeks out of the blue.

[bmzero]

Which Amasty module @seanscott49 and @bmzero? I have a few installed and run into this issue every few weeks out of the blue.

It was actually Amasty Base, but related to Shipping Rules.

[dribblecastle]

Thanks for the quick response. Do you recall if your problem was consistent with this error message or did it go away when you did a Flush of the Magento cache? For me, it occurs at random and the cache flush fixes it.