Forum OpenACS Development: Error message when using portrait upload

Hi, I've got a relatively fresh install of OpenACS 5.1.4 using Postgres 7.4 on Suse Linux Enterprise 9. When I go to "Your Account" and click on the "upload a portrait" link, I get the following error:

can't use empty string as operand of "!"
    while executing
"if { ![parameter::get_from_package_key -package_key acs-subsite -parameter SolicitPortraitP]  } {
        if { ![acs_user::site_wide_admin_p] } {
    ..."
    (procedure "subsite::upload_allowed" line 3)
    invoked from within
"subsite::upload_allowed"
    invoked from within
"if [empty_string_p $user_id] {
    subsite::upload_allowed
    set user_id $current_user_id
    set admin_p 0
} else {
    set admin_p 1
}"
    ("uplevel" body line 19)
    invoked from within
"uplevel {
    	  ad_page_contract {
    Uploading user portraits

    @cvs-id $Id: upload.tcl,v 1.1.1.1 2005/01/31 21:55:40 fastclick Exp $
} {
    {u..."
    (procedure "code::tcl::/var/lib/aolserver/fastclick/packages/acs-subsite..." line 2)
    invoked from within
"code::tcl::$__adp_stub"
    invoked from within
"if { [file exists $__adp_stub.tcl] } {

      # ensure that data source preparation procedure exists and is up-to-date
      adp_init tcl $__adp_stub
..."
    ("uplevel" body line 3)
... [lines ommitted] ... 

"ad_try {
            rp_serve_abstract_file "$root/$path"
            set tcl_url2file([ad_conn url]) [ad_conn file]
            set tcl_url2path_info..."

I searched for this error and some solutions made reference to an ad.ini file, which I don't believe exists in my version of OpenACS. I'm afraid I'm not familiar enough with the guts of the system to know exactly where to look for this missing value.

Help?

As for the cause - I'm wondering if it isn't a platform issue. I recently installed 5.1.3 on Debian Linux and did not encounter this error. More recently, I installed 5.1.4 on Suse Linux Enterprise 9 and got the error. At a glance, the code looks the same in both versions and I'm using the same version of TCL (8.4) on each box.

I'm really not sure what it could be that accounts for the apparent difference in code interpretation, if that is in fact the problem. But maybe this info will help someone down the road.