Cant start built-in database viewer

Whenever I try to open the built-in database viewer, I get the following error message: java.sql.SQLTransientConnectionException: connection exception: connection failure: org.hsqldb.HsqlException: connection exception   This started happening a few days ago, and the database viewer worked fine before that. I have tried old projects and new projects, and several different versions of Studio Pro 7 and Studio Pro 8. I have also reinstalled Studio Pro multiple times. The only thing I can think of that might have caused this is that I recently changed my JAVA_HOME from OpenJDK to the Oracle JDK, but I have tried changing that back as well as several different JDK versions of each.
1 answers

You could try the steps as described here: