opencart3 PayPal Instant Payment Notification Warning

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hello friends

from 1-2 weeks
papal send me this email

Please check your server that handles PayPal Instant Payment Notifications (IPN). IPNs sent to the following URL(s) are failing:


If you do not recognize this URL, you may be using a service provider that is using IPN on your behalf. Please contact your service provider with the above information. If this problem continues, IPNs may be disabled for your account.
Thank you for your prompt attention to this issue.

it was working fine from past 1 year no idea why its start give error code 500

in ipn history its show retry error code 500

i am using opencart
payment option paypal express checkout

also i try paypal Standard but thats also send an error same.

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