Blocking dates - won't let me

[Jennie88]

Hi everyone,

I'm trying to block a date in my calendar, but no matter how many ways I try it, or how many times I refresh my page, it gives me this message:

busy_subtype must be one of ["HOST_BUSY", "INSPECTION", "PENDING", "PERSONAL", "MAINTENANCE", "CONFIRMED"]

Does anyone know how I can block it?

Thanks!