Error Code: 5 - Message: Access is denied.
ERROR: Could not load template file: C:\Program Files\WebWatchBot 5\resource\template_alert_html.html - Error Code: 5 - Message: Access is denied.
The WebWatchBot service (named: WWBServer), by default, runs under the local SYSTEM account (Windows User Account) which is different than your currently logged in user account.
This user account, by the error given, does not have access to the file and/or directory noted.
Either change the Windows user account for the WebWatchBot service to one that has the required permission, or grant permission to the local SYSTEM account.
Once the change is made, restart the service and the error should no longer appear.