Configuration check warning:
The TS setup variable plugin.tx_realty_pi1.galleryPID is empty, but needs to be non-empty. This value specifies the PID of the page with the gallery. If this value is empty, the gallery will be disabled. Please correct the TS setup variable plugin.tx_realty_pi1.galleryPID in your TS template setup or via FlexForms.
When that is done, please empty the FE cache and reload this page.
The configuration check for this extension can be disabled in the extension manager.