My BuffaloNAS LS-QVL stuck at Resyncing RAID

My BuffaloNAS LS-QVL 4bay / 1bay per 1TB lost raid5

so I try perform Check disk and then web ui stuck at page : "Checking drive... Progress: Progress" Since 9 Nov 2021 13:14:23

and then in the NAS Navigator2 Said 3 Messages

1.E14: RAID array 1 could not be mounted.

2.I12: The RAID array is in degraded mode.

3.I14: Resyncing RAID array 1... Since 9 Nov 2021 13:14:23

So this mean I have to wait the process to complete? and is it normal that in web ui there is no Progress percentage at all?

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