Though I have not exceeded the limits. I'm getting this error. what is the problem.

Though I have not exceeded the limits. I’m getting this error. what is the problem.
app id: C963CFD9-3463-3CE1-FFF6-9EA7788DE200
<com.backendless.services.billing.ApiCallsBlockedException: The application has been blocked due to exceeding the limit

edit : I have updated my payment information to create a solution. the problem continues

Hello,
Your app Doga (ID: C963CFD9-3463-3CE1-FFF6-9EA7788DE200) has been blocked this night due to deprecating the Free Plan on version 3.

In addition to updating the payment information, you also need to select a billing plan.

Regards,
Mark

This way, we saved the day. we pass, 4.0 soon. thanx

Does it mean we should update our apps and backend to version 4 to continue using free version? Or we can not use free version anymore?

Hi, Sina.
Free version now is active only in Backendless 4.x.