This is my code exactly from example.
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
</startup>
<appSettings>
<!--<add key="Mode" value="Daily" />-->
<add key ="Mode" value ="Interval"/>
<add key="IntervalMinutes" value="1" />
<add key="ScheduledTime" value="15:00" />
</appSettings>
</configuration>