My Plesk (17.5.3) server has stopped creating scheduled backups. The log coming from the web GUI just says:

Error: server "server"
Unable to create dump

Not very helpfull. So I sshed into the server and this is the error that I can see:

[18062]: 2019-01-19 02:11:23.687 ERROR 219ed754-ae6e-48be-8a16-76c74f47bfef Unable to create dump: 
 at /opt/psa/PMM/agents/shared/Logging.pm line 129.
    Logging::error("Unable to create dump", "fatal") called at /opt/psa/admin/bin/plesk_agent_manager line 754
    main::__ANON__(Error::Simple=HASH(0x38d2448), SCALAR(0x1e104a0)) called at /usr/share/perl5/Error.pm line 340
    eval {...} called at /usr/share/perl5/Error.pm line 330
    Error::subs::run_clauses(HASH(0x38a8c88), "Can't locate object method \"lastDumpsFile\" via package \"Speci"..., undef, ARRAY(0x38abab8)) called at /usr/share/perl5/Error.pm line 427
    Error::subs::try(CODE(0x38b6e90), HASH(0x38a8c88)) called at /opt/psa/admin/bin/plesk_agent_manager line 756
    main::perform("owner-type", "server", "session-path", "/opt/psa/PMM/sessions/2019-01-19-021109.992", "exclude-pattern-file", "/opt/psa/PMM/sessions/2019-01-19-021109.992/exclude", "description", "Scheduled Backup. All configuration and content.", "gzip", ...) called at /opt/psa/admin/bin/plesk_agent_manager line 1381
    main::__ANON__() called at /usr/share/perl5/Error.pm line 416
    eval {...} called at /usr/share/perl5/Error.pm line 408
    Error::subs::try(CODE(0x15c63f0), HASH(0x3043820)) called at /opt/psa/admin/bin/plesk_agent_manager line 1389
    main::main() called at /opt/psa/admin/bin/plesk_agent_manager line 1393

I tried googling the Can't locate object method \"lastDumpsFile\" via package line or even just lastDumpsFile keyword but with 0 results.

Just in case, nothing has changed on the server since way before the backups stopped working and there is plenty of space to store the backups. Trying to create backup manually also fails with the same error, independently if is complete or incremental.

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