I have not seen this error in any post. SQL Developer version 18.104.22.168 is not launching the Start Page. When I go to Help>Start Page, the following alert box displays: Title: Start Page Error. Message: No Start Page definition exists, unable to show page.
Has anyone seen this problem? How can it be fixed please?
Thanks in advance,
Sounds like your Sql Dev installation is hosed.
Reinstall Sql Developer.