Cannot enable https on 1841 Router

I am trying to enable https on my 1841 router using the command:
Router(config)# ip http secure-server
but I keep getting the error "% invalid input detected at '^' marker"
I do not understand what could be the problem.
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Ah, makes sense...that was the reason I wanted you to post the output of the "show version" so as to verify if that was the case.  Good deal...glad you figured it out even if it doesn't get you to where you want to go, you don't have to scratch your head over it any more...;)
Post the output of the "show ver" command from the CLI.

Have you tried to do it from the SDM?  (Security Device Manager)

I believe you can get to it under Configure-Additional Tasks-Router Access-Management Access and then checking the box for HTTPS at the bottom of that screen.
AlanD_EMECOAuthor Commented:
I have found the problem. The check box for HTTPS is greyed out in Additiopnal Tasks-Router Access-Management Access. Further research shoed that I do not have the IPSec ISO Image - hence no HTTPS.
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