Memory Advisor error in Em Express

Good morning,

it's the first time for me in the community.
I am using Oracle Database 12.1.0.2.0 on Linux.

Looking for Memory Advisor in Database Express (for the container) with SYS user I select

Configuration --> Memory (I have it in Italian even setting Chrome browser in English: Configurazione --> Memoria)

but I obtain the error

ORA-01403: no data found

ORA-06512: at "SYS.PRVTEMX_MEMORY", line 466

ORA-06512: at "SYS.PRVTEMX_MEMORY", line 897

ORA-06512: at "SYS.PRVTEMX_MEMORY", line 2153

ORA-06512: at "SYS.WRI$_REPT_MEMORY", line 79

ORA-06512: at "SYS.DBMS_REPORT", line 898

ORA-06512: at line 1
I followed Doc ID 2300879.1 (the only document I found)