Error: Encountered an unknown problem while reading the database

1. What is the problem? Be very detailed.
I am unable to upload or view the forms on ODK aggregate
"Error: Encountered an unknown problem while reading the database. This often is a sign of database corruption. Please get the server logs and file an issue at"

2. What app or server are you using and on what device and operating system? Include version numbers. ODK aggregate V1.4 on app engine, Windows

3. What you have you tried to fix the problem?
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.

I'm sorry to hear you are having this issue. Please note that Aggregate is no longer being supported. Central is now the ODK server. The post below has for more details about the end-of-life for Aggregate.

@danbjoseph , Thank you for the feedback this is noted