Originally Posted by
xchs
Since from Contao 4 on all resources are protected by default, you have to publish all folders in the file manager which should be publicly accessible first:
German back end:
System > Dateiverwaltung > Öffne die Ordnereinstellungen über das Bleistifticon > Aktiviere die Checkbox "Öffentlich"
English back end:
System > File manager > Edit the folder settings with the pencil icon > Set the "Public" checkbox
Do this for all folders that should publicly accessible (e.g. your folder cto_layout/ etc.).
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