help this error

this code

<opml version="1.0">
<categories StartupScreen="0" >
<category title="Cat 1" subtitle="" url="" img="" showAsList="0" showAsPortrait="0" catAge="0">
</category>
</categories>
</opml>


Function StartupScreen()
raw = NWM_UT_GetStringFromURL( "http://127.0.0.1/config.opml" )
opml = CreateObject("roXMLElement")
opml.Parse(raw)
return ValidStr(opml.categories@StartupScreen)
End Function

ShowPosterScreen(categories, "Menu", "", "+StartupScreen()+", 0)

this erro linea red