Oracle Message ORA-06534 - Cannot access Serially Reusable package string

ERRORCannot access Serially Reusable package string
CAUSEThe program attempted to access a Serially Reusable package in PL/SQL called from SQL context (trigger or otherwise). Such an access is currently unsupported.
ACTIONCheck the program logic and remove any references to Serially Reusable packages (procedure, function or variable references) which might happen in PL/SQL called from sql context (trigger or otherwise).