Adding Row per .updateFromXML() dosn't work

I try to add a new line to a grid, but I get the error

TypeError: a.doXPath(…)[0] is undefined
…is._h2.forEachChild(c,function(a){d[a.id]=!0},this):this.forEachRow(function(a){…
dhtmlxgrid.js (Zeile 137

The Code:
mygrid.updateFromXML(‘https…’,true,true);
OR:
mygrid._refresh_mode =[true,true,false];
mygrid.loadXML(‘https://…’);
mygrid.getRowsNum();

The XML:

o 315^javascript:rpt.fill( 315 )^
XXX
XXX alt
F
F306
EX GmbH
VF
alle
alle
alle
alle
RA
FY148

0
Basis
-
-
generell
50.0
% (NL)
11.0
% (UPE)
AUT
generell 50% (NL) bis max 11% (UPE)

Please, try to wrap your xml into tag.

sometimes it is so…

thanks! thats it!