thanks to another post: Poller thinks it is broken after 1.64 update, but it isn't
I have found the way to fix it:
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remove vendor folder
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./scripts/composer_wrapper.php install --no-dev
now validate is happy
librenms@librenms:~$ ./validate.php ==================================== Component | Version --------- | ------- LibreNMS | 1.64.1-3-gb6875b7 DB Schema | 2020_04_06_001048_the_great_index_rename (165) PHP | 7.4.2 Python | 3.5.2 MySQL | 10.0.38-MariaDB-0ubuntu0.16.04.1 RRDTool | 1.5.5 SNMP | NET-SNMP 5.7.3 ==================================== [OK] Composer Version: 1.10.6 [OK] Dependencies up-to-date. [OK] Database connection successful [OK] Database schema correct