Unexpected error about Burn Redeem(Json file error)

Big Burn&Redeem worked well for this artwork ;
Thanks a lot!

But I have to closed the contract with setting end date(time) - to apply it at homepage.

But when I tried to set end date and sign the tx, below error occurs.

Thanks for your support!

It solved but I don’t know why and how.:thinking:
(Same error happened once last time)

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Thanks for letting us know!