cli error on cisco 2960-24TT switch

[kaze28]

When i am in config settings, it states that i made an invalid input yet the name is spelled correctly. Any help is appreciated.

CLI:

Switch (config) #int fa0/1

Switch (config-if) #switchport mode trunk

Switch (config-if) #switchport native vlan 50

                                                ^

⥊ Invalid input detected at  '^' marker.

[marce1000]

 - Verify available options with switchport ?  command.

 M.

[Richard Burts]

Try it with this syntax switchport trunk native vlan 50