It occurs error in the sandbox mode

[nackeymama]

When I set to sandbox mode, it will display an error such as the following after the Paypal login.
(If it is not the sandbox mode will operate normally.)

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We are sorry, we are experiencing temporary difficulties. Please try again later. If this error occurred while making a payment, avoid duplicate payments by checking your Account Overview before resending a payment.

For some browsers, this problem can be resolved by clearing or deleting cookies.

Message 3005
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Please tell me how to resolve.

[nackeymama]

solved. Thank you very much.

[Author]

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