he means you should change the 12th write_ param to 12...
PHP Code:
message_begin( MSG_BROADCAST, SVC_TEMPENTITY );
write_byte( TE_BEAMCYLINDER ); //1
write_coord( origin[0] ); //2
write_coord( origin[1] ); //3
write_coord( origin[2] - 33 ); //4
write_coord( origin[0] ); //5
write_coord( origin[1] ); //6
write_coord( origin[2] + 20 ); //7
write_short( g_flBeam ); //8
write_byte( 0 ); //9
write_byte( 0 ); //10
write_byte( 5 ); //11
write_byte( 2 ); //12 < change this one
write_byte( 2 );
write_byte( 255 ); // R
write_byte( 85 ); // G
write_byte( 0 ); // B
write_byte( 255 );
write_byte( 6 );
message_end();
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