The exception is something like: java.sql.SQLException: [SQL7008] table_name in database_name not valid for operation. The problem is usually a journaling issue. When you use the SQL statement SQL CREATE SCHEMA (or CREATE COLLECTION) a library is created and a journal is automatically created (QSQJRN) into the library. When you subsequently use CREATE TABLE and specify that schema (implicitly or explicitly), the created table is automatically journaled to QSQJRN in the schema.
For best results, use the Firefox browser..