Sorry, there was an error adding cycles to the caniste

Using NNS to add cycles to canisters, an error is reported:

Sorry, there was an error adding cycles to the canister. Caught exception while attempting to read state: Server returned an error: Code: 503 () Body: error: no_healthy_nodes details: There are currently no healthy replica nodes available to handle the request. This may be due to an ongoing upgrade of the replica software in the subnet. Please try again later.

Sorry, there was an error adding cycles to the canister. Caught exception while attempting to read state: Server returned an error: Code: 503 () Body: error: no_healthy_nodes details: There are currently no healthy replica nodes available to handle the request. This may be due to an ongoing upgrade of the replica software in the subnet. Please try again later.

Hi Haida
Do you have a specific question?
Did you try again later, as suggested in the error message?

After a while, the operation was normal again!
Thank you!

Hi, this problem has disappeared

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