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this is a simple group reaction between two particles, where im trying to make a group out of them:

<reaction>
<name>AA</name>
<type>group</type>
<educts>
<educt type="particle">A</educt>
<educt type="particle">A</educt>
</educts>
<products>
<product type="group">AA</product>
</products>
<k_forward>100</k_forward>
<k_backward>1</k_backward>
</reaction>

And i get the following error


top: 'step 74000'
action
<ExtendedIdAndType group=false id=0 type=0/>
<ExtendedIdAndType group=false id=1 type=0/>
action2
Exception in thread "main" java.lang.NullPointerException
at readdy.impl.sim.top.rkHandle.rkExecutors.StandardGroupBasedRkExecutor.execute_group(StandardGroupBasedRkExecutor.java:121)
at readdy.impl.sim.top.rkHandle.rkExecutors.StandardGroupBasedRkExecutor.executeReaction(StandardGroupBasedRkExecutor.java:78)
at readdy.impl.sim.top.rkHandle.ReactionHandler.handleOccurredReactions(ReactionHandler.java:249)
at readdy.impl.sim.top.Top.runSimulation(Top.java:133)
at readdy.impl.sim.ReaDDySimulator.runSimulation(ReaDDySimulator.java:53)

thanks for your help