Chart and MySQL persistence warnings/errors

I’ve encountered a couple of problems when setting up my small little tester system.
I’m trying to create a default chart from data taken from the mysql database.
The table is being created but no data is being sent to the database for storage.

During runtime, i get warnings like:
[WARN ] [.c.p.RetrieveRemoteDescriptors] - Device descriptor retrieval failed, no response:
[WARN ] [e.jetty.servlet.ServletHandler] - /chart
java.lang.NullPointerException: null
[ERROR] [.p.m.i.MysqlPersistenceService] - mySQL: Unable to find table for query ‘Weight’.

As for the last one (error), the item sending information to the database is called Weight, but the table created on MySQL is called items. Is there something that I’ve missed/have to change?

I can provide more logs if need be. Thanks