Cant create new SLA

Halo, please help me.
Why i cant create new SLA for new customize doctype? i create new doctype “Ticket” from duplicate “Issue”.

Please tell me what should i do to fix this issue.

for aditional information, my doctype alreadyhave seervice_level_section.

anyone please help me. i am stuck in here.

Is this a local instance or Frappe cloud?
What version of ERPNext is this?
Have you tried migrating the site once? (It should reset all the doctype fields based on their respective json files)

its self hosting, erpnext v15
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