I am attempting to save and display a pdf file in a mobile app using the following code.  of_loadlocalfile returns -1 and the code displays the following message:

loadlocalfile error: "rc: -1 file: /var/mobile/Containers/Data/Application/7BC99...490/Documents/17574048/plugin/Leads.pdf error:"

What am I doing wrong?

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int  li_rc
string ls_filename = 'Leads.pdf'
string ls_filepath
eon_mobile_webviewex luo_webview

li_rc = dw_prospect_admin.saveas(ls_filename, PDF!, true)
if li_rc <> 1 then
    messagebox('saveas error', 'rc: ' + string(li_rc))
    return
end if

if gs_clienttype = 'MOBILE' THEN
    ls_filepath = appeongetcachedir() + '/plugin/' + ls_filename
    if not fileexists(ls_filepath) then
        messagebox('file does not exist', ' file: ' + ls_filepath)
        return
    end if
    luo_webview = create eon_mobile_webviewex
    li_rc = luo_webview.of_loadlocalfile (ls_filepath)
    if li_rc = 1 then
        messagebox('loadlocalfile success', 'file: ' + ls_filepath)
    else
        messagebox('loadlocalfile error', 'rc: ' + string(li_rc) + ' file: ' + ls_filepath + ' error: ' + luo_webview.is_errortext)
    end if
    destroy luo_webview
end if