Oracle 12 EM express Load Error Ora-06512

Hello,

I've installed Oracle 12 DB and then imported data from a full TTS (transportable TBS). And the DB seems working OK.

But when logging in EM Express with Sys User I got this error and could not get further :

ORA-06502: PL/SQL: numeric or value error

ORA-06512: at "SYS.DBMS_ASSERT", line 409

ORA-06512: at "SYS.DBMS_ASSERT", line 493

ORA-06512: at "SYS.DBMS_REPORT", line 1529

ORA-06512: at "SYS.DBMS_REPORT", line 1597

ORA-06512: at "SYS.PRVTEMX_ADMIN", line 1250

ORA-06512: at "SYS.WRI$_REPT_CONFIG", line 196

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

ORA-06512: at line 1

Thanks and regards,

Kim