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It seems you are using quite an older version of the SQL Developer, can you upgrade to the latest version and try again?
You can download the latest version here:
I downloaded a later version and this has resolved the issue.
Oracle SQL Developer 3.2.20.09
Data Miner oracle.dmt.dataminer 22.214.171.124.09.87 Loaded
Removed the old repository and installed the new updated and the issue was resolved.