A command from the RDF4J framework is throwing an error

Question

When running the following commands, an error is thrown by the add command. The rdf4j framework is used for communicating with a graphdb Knowledge Base:

 import org.eclipse.rdf4j.model.Model;

Model model;
//statements have been added to the model

 public RepositoryConnection connection;
 ...
 connection.add(model); <-- error is thrown

An error is thrown in add command

2022-01-24 09:46:02 [http-nio-8080-exec-5] ERROR restapi.SubmitRMService - unable to rollback transaction. HTTP error code 404
org.eclipse.rdf4j.repository.RepositoryException: unable to rollback transaction. HTTP error code 404
        at org.eclipse.rdf4j.http.client.RDF4JProtocolSession.rollbackTransaction(RDF4JProtocolSession.java:786)
        at org.eclipse.rdf4j.repository.http.HTTPRepositoryConnection.rollback(HTTPRepositoryConnection.java:354)
        at org.eclipse.rdf4j.repository.base.AbstractRepositoryConnection.conditionalRollback(AbstractRepositoryConnection.java:335)
        at org.eclipse.rdf4j.repository.base.AbstractRepositoryConnection.add(AbstractRepositoryConnection.java:379)

The code is running successfully in two other environments except one we are setting with kubernetes. We ensured that /opt/graphdb/home has write permissions.

Question: I just do not understand the 404 RepositoryException error. The code can successfully run queries before the .add(model), so the connection with the graphdb is ok.