Woocommerce Wordpress Exclamation Mark at Checkout. Where to look for a solution?

Question

Online shopping

Woocommerce Wordpress exclamation mark at checkout Other
than that, there is no description of the problem
And then the order is not confirmed, although it goes into the pending payment status.
I changed payment methods, but it did not affect.

Where to look for a solution to the problem and most importantly how?

Answer 1

Most likely, the payment is the case if the remaining fields are ready, or see why the error is.

Answer 2

I figured out the old method of disabling all plugins and by brute force I found out that the telsender plugin was in conflict

Answer 3

Had the same problem. The telsender plugin is not worth it.
By disabling plugins, it turned out that the same error is caused by the plugin - Saphali Woocommerce Russian.
Turned it off and everything worked.