The media_slack.yaml template script seems to be containing invalid javascript code.

The following statement contains an unescaped secondary single quote which causes an "Missing ; before statement" or "Error: Line 116: Unexpected identifier" (depending on the validator)

throw 'Can't process event tags: ' + error;

This seems to apply to the media_slack.xml of version 5.0 as well. 4.4 and below doesn't appear to be affected as the script is significantly different in that version.