SQL*Plus does not execute SQL scripts that SQL Developer does

Question

I am facing a very annoying problem. I have written (in Notepad++) some SQL scripts. Now when I try to execute them by SQL*Plus (through the command line, on Windows 7), I a

Answer 1

Remove the empty lines.
In sqlplus an empty line means stop previous statement and start a new one.

or you can set blank lines:

set sqlbl on