Scheduled task error instantiating agent

Question

Has anyone seen this one before? It's complaining about no matching constructor, but the implementation class has no other constructor other than the default.

This is Sitecore 9.1.1 btw.

2456 03:00:22 WARN  Could not find constructor in ReflectionUtil.CreateObject: Availity9.ScheduledTasks.CacheWarmer. The constructor parameters may not match or it may be an abstract class. Parameter info: Count: 2. Parameter types: System.String, System.String

2456 03:00:22 ERROR Error while instantiating agent. Definition: web/sitecore/system/tasks/schedulestrue

Exception: Sitecore.Exceptions.ConfigurationException

Message: Could not create instance of type: Availity9.ScheduledTasks.CacheWarmer. No matching constructor was found.

Source: Sitecore.Kernel

   at Sitecore.Configuration.DefaultFactory.CreateFromTypeName(XmlNode configNode, String[] parameters, Boolean assert)

   at Sitecore.Configuration.DefaultFactory.CreateObject(XmlNode configNode, String[] parameters, Boolean assert, IFactoryHelper helper)

   at Sitecore.Configuration.DefaultFactory.CreateObject(XmlNode configNode, Boolean assert)

   at Sitecore.Tasks.Scheduler.ReadAgents()

Thanks, Bill

Answer 1

Ok so I learned that in the config entry, tags become parameters that your method signature must have. Other tags within the entry must be properties in your implementation class.

It's a whole other story if you define the tasks in CMS system->Tasks (Commands and Schedules).

In my case I didn't need any of the parameters or properties that were in the examples I'd found online.

And naturally I was defining the tasks both in CMS and config, and was getting errors from both.

Then I happened upon an article that boils it down to the simplest way of implementing a task and defining it in a config patch at Jon D Jones site:

https://www.jondjones.com/learn-sitecore-cms/sitecore-developers-guide/sitecore-events/how-to-set-up-a-scheduled-task-in-sitecore

Once I deleted the CMS commands and schedules and implemented the simple way, all works fine. The only caveat would be the xdt:Transform="Insert" property in his tag. That gave me an error and I just removed it and all was fine.