This situation occurs when you try to open an SQL database which was created with JabRef version older than 3.6.
With release of JabRef 3.6arrow-up-right the SQL database structure has changed. So all SQL databases with an pre-3.6 structure are no longer supported.
To migrate your pre-3.6 SQL database into new shared SQL database you have to follow these steps:
Download and install JabRef 3.5arrow-up-right
Open JabRef and goto File -> Import from external SQL database
Enter required data and click on Connect
Choose the database which should be imported and press Import
Save the database locally (File -> Save database)
Turn back at least to JabRef 3.6arrow-up-right
Goto: File -> Open shared database
Now goto File -> Import into current database
Choose the file you saved locally and import it
After that the content is available as a shared SQL database and you can work live on it. More information about the live editing.
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