ODK Aggregate with ODK collect on DigitalOcean

1. What is the problem? Be very detailed.
I installed odk aggregate in the digitalOcean cloud.

when i access from my phone via odk collect i have this message as an attachment.

how can i solve the problem?
2. What app or server are you using and on what device and operating system? Include version numbers.
ODK Aggregate v2.0.5 in digitalOcean with ODK collection
3. What you have you tried to fix the problem?

I see the two survey forms but I cannot download.

4. What steps can we take to reproduce the problem?

5. Anything else we should know or have? If you have a test form or screenshots or logs, attach below.