Problems creating a trigger in Oracle 11g

Question

I get a weird error while trying to create a trigger in my Oracle 11g database using SQL Developer. Here is what I did:

My table:

Answer 1

I finally found the answer to my problem:

Add this:

ALTER SESSION SET PLSCOPE_SETTINGS = 'IDENTIFIERS:NONE';

Or in Oracle SQL Developer:

1. Go to Tools | Preferences
2. Select Database | PL/SQL Compiler
3. Change the PLScope identifiers from All to None
4. Click on Ok

This fixes the issue...