Undefined Procedure with elseif when using comments

I am having trouble committing the following iRule when adding in comments above the elseif statements. It always interprets the first comment it finds above an elseif statement as the offender.

01070151:3: Rule [/Common/Main_Website_80_Revised] error: /Common/Main_Website_80_Revised:7: error: [undefined procedure: elseif][elseif {[class match [HTTP::host] eq group_80_encrypt]} {
HTTP::redirect https://[getfield [HTTP::host] ":" 1][HTTP::uri]
}]

Removing all comments (aside from line 2, that one seems fine) will commit the iRule without any issue. Any idea what might be going on?

when HTTP_REQUEST {
    302 redirect to a different URL based on hostname
    if {[class match [HTTP::host] eq group_80_host_redirect]} {
        HTTP::redirect [class match -value [HTTP::host] eq group_80_host_redirect]
    }
    302 redirect to enforce HTTPS based on hostname or URI
    elseif {[class match [HTTP::host] eq group_80_encrypt]} {
        HTTP::redirect https://[getfield [HTTP::host] ":" 1][HTTP::uri]
    }
    Pool selection based on hostname
    elseif {[class match [HTTP::host] eq group_80_host_pool]} {
        pool [class match -value [HTTP::host] eq group_80_host_pool]
    }
    Pool selection based on URI
    elseif {[class match [HTTP::uri] starts_with group_80_uri_pool]} {
        pool [class match -value [HTTP::uri] starts_with group_80_uri_pool]
    }
    else {
        pool Main_80_Pool
    }
}