Invocation of method 'isShowSignUp' in class com.atlassian.confluence.user.actions.LoginAction threw

[Mo - Admin]

Hi,

I read this article on how to fix this issue http://localhost:8090/login.action?os_destination=%2Findex.action&permissionViolation=true but I cannot figure out how to log into the DB to run the command. Can someone please explain how I can access and modify my Confluence DB?

Thanks,
Adrian