Cause: The program attempted to access a Serially Reusable package in PL/SQL called from SQL context (trigger or otherwise). Such an access is currently unsupported. See the solution below.
Error solution: Check 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).
Database version: Oracle 11g Release 2 (11.2)