From OpenSCADAWiki
Status of the template is shown in the "Error (err)" attribute with information about the mode and position of the read data of the archives. Due to the communication is slow and archives can be big, status of the read archive data saved at it change, that is you can stop the template or disable PC in whole but the template will continue the archives reading from saved position and not from the begin, which reset you can by the proper boolean attribute.