Strange issues on build...

[wehrend]

I've having some issues with hugo related to the book theme currently. Working on my laptop, so I cannot verify what the issue here... So cant lookup what I could simply check on my workstation...

Error: Error building site: "/src/content/themes/hugo-book/layouts/_default/_markup/render-image.html:1:1": unmarshal failed: invalid character '{' looking for beginning of object key string
Built in 2398 ms

the mentioned file looks like the following:

{{- if .Page.Site.Params.BookPortableLinks -}}
{{- template "portable-image" . -}}
{{- else -}}
<img src="{{ .Destination | safeURL }}" alt="{{ .Text }}" {{ with .Title }}title="{{ . }}"{{ end }}/>
{{- end -}}

{{- define "portable-image" -}}
{{- $isRemote := or (in .Destination "://") (strings.HasPrefix .Destination "//") }}
{{- if not $isRemote }}
{{- $path := print .Page.File.Dir .Destination }}
{{- if strings.HasPrefix .Destination "/" }}
{{- $path = print "/static" .Destination }}
{{- end }}
{{- if not (fileExists $path) }}
{{- warnf "Image '%s' not found in '%s'" .Destination .Page.File }}
{{- end }}
{{- end }}
<img src="{{ .Destination | safeURL }}" alt="{{ .Text }}" {{ with .Title }}title="{{ . }}"{{ end }}/>
{{- end -}}