Did you read the upgrade instructions, especially for version 0.3.0?

https://docs.janusgraph.org/changelog/#upgrade-instructions_1

Am Donnerstag, 24. Oktober 2019 01:46:18 UTC+2 schrieb Baskar Vangili:

I have recently upgraded to Janus 0.4. But I have few graphs which were created using V 0.2.  When I open the older graph, I get the following error.

gremlin> getTraversalSource("4baa2b25-409c-4478-82eb-b225674b4ba2").V().count()

Please create configuration for this graph using the ConfigurationManagementGraph#createConfiguration API.

Type ':help' or ':h' for help.

Display stack trace? [yN]N

Any idea how to upgrade those older graphs to 0.4.0? Otherwise, how to open the older version of the graph using newer version of janus?

I don't want to drop and recreate the graph as I will lose all the data.

Thanks for your help.