Error from Index+ Web Server (hixclient)

Can't determine action
Error in tag evaluation for <_IXFILE_>
Can't open "../ixroot/default/Error: access to uninitialised variable - doctype
***  in function "(Unknown)"
***  line: return (doctype)
"
Can't open ../ixroot/default/Error: access to uninitialised variable - doctype
***  in function "(Unknown)"
***  line: return (doctype)
: No such file or directory