Errors in Chess

I have Chessmaster 11. I often analyze my RHP games on it. In the Analysis and Auto-Annotation window there are two components I don't understand: Total Error and Relevant Error. Can someone explain what these mean and what the numbers beside them represent?

If ChessMaster thinks you made a move that damaged your own position, then this shows up in the "Total errors" and in the "Relevant errors".

If instead it thinks that you failed to see the best attacking move, but made a harmless move instead, then this shows up in "Total errors" but does not count as a "Relevant error".