Cron job will not retrieve email after upgrade

[chines]

HI,
I upgraded from OTRS Version 4.0.5 to version 5.0.7 yesterday. All is well, with the exception of automated email retrieval. When I use the command "./otrs.Console.pl Maint::PostMaster::Read" I get an error

Code: Select all

Feb 25 08:59:56 <user.err> ext1 OTRS-otrs.Daemon.pl - Daemon Kernel::System::Daemon::DaemonModules::SchedulerGenericAgentTaskManager-10[78008]: [Error][Kernel::System::ObjectManager::_DieWithError][Line:533]: Kernel::System::Daemon::DaemonModules::SchedulerGenericAgentTaskManager depends on Kernel::System::DynamicField::Backend, but the constructor of Kernel::System::DynamicField::Backend returned undef.

When I use the "Fetch Mail" link on the Mail Account Managemnt screen I see the same error in the log, but the system actually succeeds in retrieving the email. When I run "./otrs.Console.pl Maint::PostMaster::Read" it does not succeed

I found similar issues here with no resolution.
viewtopic.php?f=35&t=31262&p=127368&hil ... f.#p127368

viewtopic.php?f=35&t=30751&p=125986&hil ... f.#p125986

I am using Freebsd 10.1-RELEASE-p26, mysql 5.1.73_2

I have tried resaving all Dynamic Fields (I don't intentionally use any Dynamic Fields anyway) as suggested in the post above.

Any help would be greatly appreciated.

Thanks!