MailChimp task error

Getting an error when MailChimp auto task runs. Can anyone help?

Error while running the 'MailChimp sync' schedule task. No parameterless constructor defined for this object.

System.MissingMethodException: No parameterless constructor defined for this object. at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck) at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache) at System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean skipCheckThis, Boolean fillCache) at System.Activator.CreateInstance(Type type, Boolean nonPublic) at Nop.Services.Tasks.Task.CreateTask() in xxxx\Libraries\Nop.Services\Tasks\Task.cs:line 49 at Nop.Services.Tasks.Task.Execute() in xxxxxxLibraries\Nop.Services\Tasks\Task.cs:line 66

Darren

What version are you using? 2.50 or upcoming 2.60?

BTW, can you please post your \Plugins\Nop.Plugin.Misc.MailChimp\MailChimpSynchronizationTask.cs and \Libraries\Nop.Services\Tasks\Task.cs files here?