Github user milamberspace commented on the issue:
https://github.com/apache/cloudstack/pull/1615
@serg38 Root cause of the issue found.
In the 4.9.1.0 branch, the commit 2e77496601ab5420723ce8b955b3960faaba7d5c
(CLOUDSTACK-9438: Fix for CLOUDSTACK-9252 - Make NFS version changeable in UI)
hasn't exists, so the schema-481to490.sql file doesn't contains the SQL
request...
Probably this issue will be a blocker for the 4.9.1.0 RC1...
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