Upgrade from 0.13.1 to 0.14.x failed

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I try to upgrade krill from 0.13.1 to 0.14.4 but failed:

# krillup prepare -c /etc/krill.conf
*** Error Preparing Data Migration ***
Upgrade preparation failed because of: Keystore Error: Store error: unknown error

Note that your server data has NOT been modified. Do not upgrade krill itself yet!
If you did upgrade krill, then downgrade it to your previous installed version.

From log:

2024-01-30 15:03:38 [ERROR] Krill failed to start: Upgrade data migration failed with error: Upgrade preparation failed because of: Keystore Error: Store error: unknown error

NOTE: your data was not changed. Please downgrade your krill instance to your previous version.
2024-01-30 15:04:03 [ERROR] Krill failed to start: Upgrade data migration failed with error: Upgrade preparation failed because of: Keystore Error: Store error: unknown error