Start service failed

Hi I’m trying to install Home Assistant on a Raspberry. I’m new to Linux and have tried to follow a installation guide.
When I come to the part where I should make the service start automatically, I get the following error.

”Failed to start homeassistant.service: Unit homeassistant.service is masked.”
Anyone with any idea?

I am afraid you will have to be a little more specific for anyone to be able to help. Which guide did you follow? What did you put in the configuration file? What command did you type to get the error?