Hi, I am trying to edit the System Process Calendar to change the 31st of Decemb

Hi, I am trying to edit the System Process Calendar to change the 31st of December as a working day. When I clear the "Mark as non-working day" box and save the change, the page doesn't respond for approx. 1 min and return the bug in the print screen attached. When I refresh then the page, back to normal but the 31st December is still non-working day. Could you please help? Thanks....

OriginalPostID-128274

OriginalPostID-128274

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