No switchport: command rejected, not allowed on this interface(3560X)

[sean chang]

I got great help from experts here, so I just keep asking for help on our new catalyst 3560X switch(12.2(58)SE1).

Purpose: Intervlan routing,

actions taken:  I created Vlan10 with 10.10.1.1/24; vlan20 with 10.20.1.1/24 on this new switch, IP routing enabled, Vlan 1 is 10.1.10.2/24  for management

Problem: on a new port ( unconfigured ):

>interface GigabitEthernet0/24

>no switchport

command rejected, not allowed on this interface

I have googled a while but couldn't firgured out why this command is rejected, what should I prepare the port before I can run "no switchport"?

Any suggestions and advises are greatly appreciated.

[fhk]

ESW3#show version
*Mar 1 00:02:07.607: %SYS-5-CONFIG_I: Configured from console by console
ESW3#show version
Cisco IOS Software, 3700 Software (C3725-ADVENTERPRISEK9-M), Version 12.4(15)T14, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Tue 17-Aug-10 12:08 by prod_rel_team

ROM: ROMMON Emulation Microcode
ROM: 3700 Software (C3725-ADVENTERPRISEK9-M), Version 12.4(15)T14, RELEASE SOFTWARE (fc2)

ESW3 uptime is 2 minutes
System returned to ROM by unknown reload cause - suspect boot_data[BOOT_COUNT] 0x0, BOOT_COUNT 0, BOOTDATA 19
System image file is "tftp://255.255.255.255/unknown"

This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
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