v2.01 Undefined subroutine &Mail::MtPolicyd::SessionCache::Memcached::usleep

[LuckyFellow]

If configured using Memcached as session storage and if mails from the same user gets processed too frequently, I receive this error message:

error while processing request: Undefined subroutine &Mail::MtPolicyd::SessionCache::Memcached::usleep called at /usr/local/share/perl/5.20.2/Mail/MtPolicyd/SessionCache/Memcached.pm line 30, line 104.\n

in file: /usr/local/share/perl/5.20.2/Mail/MtPolicyd/SessionCache/Memcached.pm
Line 30 is: usleep( $self->lock_wait * $try );
Changing it to: Time::HiRes::usleep( $self->lock_wait * $try );

solves the error.

[LuckyFellow]

Same is true for: /usr/local/share/perl/5.20.2/Mail/MtPolicyd/SessionCache/Redis.pm