I have a page in CloudPages containing some content blocks. I want to execute some AMPscript on the page, that retrieves either an sf-object or some data from a DE.
I have no more than this so far
SET @id = RequestParameter('id')
because as soon as I'm adding
SET @s = RetrieveSalesforceObjects('Subscription__c', 'Id, Contact__c', 'Contact__c', '=', @id)
SET @s = LookupRows('Subscription__c_Salesforce', 'Contact__c', @id)
(either one, not both at the same time) to the script, the resulting page is displayed blank (not even 500 internal Error, but literally blank).
The preview renders correctly though. What am I missing?