Read the log of an Idoc in error status

Hello:

I am creating non standard WF for notifying Idoc in error status to my users.

One of them are requesting to me to send the Log of the idoc in error status in to the notification mail from the WF. I am talking about the error that appear in WE02 transaction, like fig 1:

My Idea is get this message using a method into a task and I´d like to know how.

Any master could help me please?

Thanks a lot, regards