galera.galera_encrypt_tmp_files MTR failed: Get error failed to enable encryption of temporary files

galera.galera_encrypt_tmp_files 'innodb' w2 [ fail ]  Found warnings/errors in server log file!

        Test ended at 2019-06-06 15:03:10

line

2019-06-06 15:03:03 281472940498944 [ERROR] Couldn't load plugins from '@ENV.FILE_KEY_MANAGEMENT_SO.so'.

^ Found warnings in /dev/shm/var/2/log/mysqld.1.err

ok

line

2019-06-06 15:03:07 281473257275392 [ERROR] Couldn't load plugins from '@ENV.FILE_KEY_MANAGEMENT_SO.so'.

^ Found warnings in /dev/shm/var/2/log/mysqld.2.err

ok

 - saving '/dev/shm/var/2/log/galera.galera_encrypt_tmp_files-innodb/' to '/dev/shm/var/log/galera.galera_encrypt_tmp_files-innodb/'

Retrying test galera.galera_encrypt_tmp_files, attempt(2/3)...

worker[2] > Restart  - not started

worker[2] > Restart  - not started