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Problem loading tree

What can possibly be the problem here?
I guess it might be a duplicate id problem, but could someone please take a look just to make sure?

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The next error ocured :<BR><STRONG>Number expected</STRONG> in <STRONG>https://ludo/treecontroller?Action=LoadTree&japee.actionContext=7</STRONG> at line <STRONG>40</STRONG>

Tree 0
parentObject=[object]
_itim_dg=true
dlmtr=,
dropLower=false
xmlstate=1
mytype=tree
smcheck=true
width=100%
height=100%
rootId=0
childCalc=null
def_img_x=18px
def_img_y=18px
def_line_img_x=18px
def_line_img_y=18px
_dragged=
_selected=
style_pointer=hand
_aimgs=true
htmlcA= [
htmlcB=]
lWin=[object]
cMenu=0
mlitems=0
dadmode=0
slowParse=false
autoScroll=true
hfMode=0
nodeCut=
XMLsource=/treecontroller?Action=GetDhtmlxXML&japee.actionContext=7
XMLloadingWarning=0
_idpull=[object Object]
_pullSize=71
treeLinesOn=true
tscheck=false
timgen=true
dpcpy=false
_ld_id=null
_oie_onXLE=
imPath=../../images/
checkArray=iconUncheckAll.gif,iconCheckAll.gif,iconCheckGray.gif,iconUncheckDis.gif,iconCheckDis.gif,iconCheckDis.gif
radioArray=radio_off.gif,radio_on.gif,radio_on.gif,radio_off.gif,radio_on.gif,radio_on.gif
lineArray=line2.gif,line3.gif,line4.gif,blank.gif,blank.gif,line1.gif
minusArray=minus2.gif,minus3.gif,minus4.gif,minus.gif,minus5.gif
plusArray=plus2.gif,plus3.gif,plus4.gif,plus.gif,plus5.gif
imageArray=leaf.gif,folderOpen.gif,folderClosed.gif
cutImg=0,0,0
cutImage=but_cut.gif
dragger=[object Object]
htmlNode=[object Object]
allTree=[object]
XMLLoader=[object Object]
no_cashe=true
dhx_SeverCatcherPath=
_onEventSet=[object Object]
ehlt=true
dADTempOff=false
dragAndDropOff=true
_ddronr=true
skipLock=true
parsCount=1
nodeAskingCall=
parsingOn=0
parsedArray=[object]
setCheckList=
npl=70
lastLoadedXMLId=-1
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Is provided data a full error output?
The second and third sections which must contain details about xml and inner structure are missed, that may be caused by incorrect XML generated on server side. 
If issue still occurs for you - please provide a sample of problematic XML ( you can send it directly to support@dhtmlx.com )