Oracle Message ORA-24242 - anonymous access through a dynamically authenticated Database Access Descriptor (DAD) prohibited

ERRORanonymous access through a dynamically authenticated Database Access Descriptor (DAD) prohibited
CAUSEAn attempt to allow anonymous access through a dynamically authenticated Database Access Descriptor (DAD) was prohibited.
ACTIONMake sure the Database Access Descriptor (DAD) is not dynamically authenticated before allowing anonymous access through it.