The trend tag identified is wired to a constant block. It might be using processing time in the controller uselessly, as well as possibly being sent to the history system, using data bandwidth and often disk space.
--Post Processing drawing 17704ZY Trend block Module 1,77,04 Block 485 FC 66 is wired from constant block 5 (0.0).
This error can be built directly into Hyperview. For more information, see the article Building error reports into the M14.