You've created your List and tweaked it to be just how you want filters wise and the correct data view columns, clicked that preview button and the following appears in a grey pop out box:
Error retrieving data:SyntaxErrod: Enexpected token < in JSON at position 0
It could be that a transient cache error arose on your web browser - you can quickly resolve this by either:
- Closing your browser and restarting it.
- Ensuring that the latest update to your browser has been applied fully (3 dots on the top right of your screen, Settings > About...)
- Clearing cache, as described in the following article on our Knowledge Base: Constituent Panel, Timeline or Lists not Displayed Properly
If you find the error message is persistant, then please do contact our Support team via the Support button on the left of the page.