An exception has been thrown during the rendering of a template ("Array to string conversion")

Hello, i've been facing this error for a while and i cant find a fix to it. The code is below, maybe anyone knows how to handle it? Thank you in advance

and my blueprint is

title: Project
'@extends':
    type: default
    context: blueprints://pages

form:
  fields:
    tabs:
      type: tabs
      active: 2

      fields:
        content:
          fields:
                header.imgUrl:
                  type: text
                  label: First image link

                header.image:
                  type: file
                  label: First image
                  destination: 'user/themes/antimatter/images'

Try {{ image|first.path }} or {{ theme_url ~ '/images/' ~ image|first.name }}.

For some reason, I remember {{ image|first.path }} not routing correctly on subpages, so I included the second one. Both should work though.

@bbricker87:
{{ theme_url ~ '/images/' ~ image|first.name }}

Both options seems working perfectly thank you ! :)