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Importing a model from data dictionary.
File > Data Modeler > Import > Data Dictionary
After continuing the message "Generate Design..." hang up.
I tried a second time and I didn't received the error and created successfully created the model.
Oracle SQL Developer 18.104.22.168
IDE Version: 22.214.171.124.42.150416.1320
Product ID: oracle.sqldeveloper
Product Version: 126.96.36.199.07
Oracle IDE 188.8.131.52.07
Java(TM) Platform 1.8.0_40
Versioning Support 184.108.40.206.07