I've moved your question to the SQL Developer forum.
I cannot be 100% sure but this seems to be a problem with the underlying database being out of disk space to store the new data in.
Try contacting your DBA and have him check the disk space available to your database.
Irian gave the answer. You are running out of space in your tablespace - where Oracle stores the data. The table space needs to be expanded, possibly by adding a new data file to provide more space or possibly deleting unneeded data (possibly not; even if data is purged there might not be enough contiguous space and you might get the same error again)
If your DBA can fix this give some points to Irian