magento 2 "Some item options or their combination are not currently available"

[simo_web778]

HI

Magento ver. 2.2.6

Template : Sm Market

When I add a configurable product, in the cart page shows an error.

"Some item options or their combination are not currently available"

[dipmegpro]

Hello @simo_web778 

Can you please check those options quantity?

[simo_web778]

the quantity of the configurable product is 800 

[dipmegpro]

Hello @simo_web778 

Is All the chield products have the proper quantity. and in cart have only one product?

[simo_web778]

yes i have only one product

this is the chield products price   quantity (800). statu (active)