“SQL -Entwickler SQL -Arbeitsblatt nicht angezeigt” Code-Antworten

SQL -Entwickler SQL -Arbeitsblatt nicht angezeigt

I was able to solve this by :

Closing SQL developer
Deleting the file SqlHistory.xml that is located at C:\Users\AppData\Roaming\SQL Developer\. Alternatively, you can rename it to e.g SqlHistoryOLD.xml
Now when you open SQL developer and create a new SQL worksheet, it will work :)