Hello, did you try the solutions from this website? https://support.designbuilder.co.uk/index.php?/Knowledgebase/List/Index/13/radiance-daylighting or https://support.designbuilder.co.uk/index.php?/Knowledgebase/Article/View/205/0/annual-daylighting-internal-error-reinsrccal-cannot-openhttps://support.designbuilder.co.uk/index.php?/Knowledgebase/List/Index/13/radiance-daylighting