sqlplus script with utf-8 / 16 encoding

Hello,

I have two files with encoding utf- 8 and utf-16

When i run sqlplus for script with utf-16 i get SP2-0042: unknown command " ■C" - rest of line ignored.

when i run sqlplus for script with utf-8 i get many errors like:

SP2-0734: unknown command beginning "END FLX_CA..." - rest of line ignored.

                (i_OrgID IN NUMBER,

                 *

ERROR at line 1:

ORA-00928: missing SELECT keyword

Warning: Package Body created with compilation errors.

BEGIN

Which file encoding is correct to run with sqlplus ?

Best regards,

M.