Hi Pedro,
As Philip said, the analyst on the support team will help you diagnose further. But, would you like to also share some info with us related to your survey in case there is a simple fix to the issue?
1. Have you included any sort of image in your survey? If yes, is it linked by URL or uploaded from local devices. and what is the name of the image?
2. Have you included any special characters in your survey?
3. How many questions are there, and which question types have you used?
Thanks,
Ruth