No ack for postMessage onApprove() in 10000ms

[gkv_1234]

I have implemented subscription api in my website.
on checkout popup page sometime I am getting "no ack for postMessage  onApprove() in 10000ms".
Why this is happening?
I am using visual studio  2015 asp.net c# code.

Please see attachment for error description.

[yiusay]

Can you check my reply on this thread and give us some feedback?

https://www.paypal-community.com/t5/PayPal-Payments-Standard/CRITICAL-Paypal-smart-button-onApprove-...

Please also let us know if you have already solved this problem.

Thank you!

[Valentin64]

Any solution? I am dealing with this.