Echec création du dot/svg graphviz

Sur la démo (https://unl.demo.tetras-libre.fr/unl2rdf) la création du dot/svg graphviz plante sur l'entrée ci dessous.

@Sebastien Peux-tu voir la cause ?

[S:00]
{org:en}
The system shall allow an operator to adjust the brightness of the POC touch panel while still leaving an operable screen for the operator (neither all white nor all black). 
{/org}
{unl}
agt(allow(icl>do,equ>permit,agt>volitional_thing,obj>uw,ben>volitional_thing).@entry.@present.@promise,system(icl>group>thing).@def)
agt:02(adjust(icl>change>do,equ>correct,cob>thing,agt>volitional_thing,obj>thing).@entry,operator(icl>function>thing):01.@indef)
obj:02(adjust(icl>change>do,equ>correct,cob>thing,agt>volitional_thing,obj>thing).@entry,brightness(icl>light>thing,ant>dullness).@def)
mod:02(touch(icl>contact>thing),poc)
mod:02(panel(icl>sheet>thing).@def,touch(icl>contact>thing))
obj:02(brightness(icl>light>thing,ant>dullness).@def,panel(icl>sheet>thing).@def)
dur:02(panel(icl>sheet>thing).@def,while(icl>how,equ>whilst,tim<uw,obj>uw))
man:03(leave(icl>refrain>do,agt>thing,obj>thing,asp>thing).@entry,still(icl>how,com>duration))
mod:03(screen(icl>surface>thing).@indef,operable(icl>adj))
obj:03(leave(icl>refrain>do,agt>thing,obj>thing,asp>thing).@entry,screen(icl>surface>thing).@indef)
ben:03(leave(icl>refrain>do,agt>thing,obj>thing,asp>thing).@entry,operator(icl>function>thing):02.@def)
qua:01(white(icl>person>thing),all(icl>quantity,ant>some,per>thing):01)
obj:01(neither_nor(icl>how,equ>nor,com>two_options,obj>uw,and<uw),white(icl>person>thing))
and:01(black(icl>achromatic_color>thing,ant>white),neither_nor(icl>how,equ>nor,com>two_options,obj>uw,and<uw))
qua:01(black(icl>achromatic_color>thing,ant>white),all(icl>quantity,ant>some,per>thing):02)
cnt:03(operator(icl>function>thing):02.@def,:01.@parenthesis)
obj(allow(icl>do,equ>permit,agt>volitional_thing,obj>uw,ben>volitional_thing).@entry.@present.@promise,:02)
obj:02(while(icl>how,equ>whilst,tim<uw,obj>uw),:03)
{/unl}
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