Expecting: valid IPv6 CIDR

What might be a problem ? : add new dhcp client interface by luci failed: @ with An error occurred while saving the form:
*Option "IPv6 ULA-Prefix" contains an invalid input value." i've seen option IPv6 ULA-Prefix set - "auto" while ipv6 CIDR addr expected, however no automated ipv6 address appeared..?

The ULA-Prefix is a global option and usually comes prefilled in.
What is the output of uci export network ?

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