Post the link please and maybe someone can help.
@lwolfs also see this topic OH 2.5M4 Error Installing Influx and Grafana - #3 by thisisIO you may need to use translation for the video.
Did you create an influx.persist file and use default strategy?
Example:
Strategies {
everyMinute : "0 * * * * ?"
everyHour : "0 0 * * * ?"
everyDay : "0 0 0 * * ?"
every15min : "0 0/15 * * * ?"
default = everyMinute
}
Items {
Your item here
}