Fronius_inverter custom_component not found

When installing the custom_components “fronius_inverter” I get the message:

Platform error: sensor - Integration ‘fronius_inverter’ not found.

14.25 config.py (ERROR)

I have tried it both on my Synology Docker, and a Ubuntu 18.04, and both yields the same response.

I am running version Home Assistant 0.102.2

What am I doing wrong!