Could not get reference to OpenSpan.Services.IDriverEventServiceEx.

Start: Exception invoking method - Could not get reference to OpenSpan.Services.IDriverEventServiceEx.

We have checked, Pega Notification manager is running.

@AnuroopSamratS16978510I would need to look at a RuntimeLog and likely your environment to really determine the issue. The only time I have ever seen this is when the Pega Notification Manager isn’t running. Does this occur after restarting the machine? Is the service set to automatic or manual?