First of all your model doesn't use one of the standard created tasksequences. Each time you activate in the properties of an object an action of an operator a tasksequence is created. This tasksequence tells the operator what to do in tasks ordered in a sequence. The TASKTYPE_PICKOFFSET doesn't belong to the standard transport tasksequence or the utilize tasksequence. This means you or someone else created a the tasksequence in the model. The invalid pointer should contain a reference to the specific item that must be picked in the faulty task. You have to find the object or ProcessFlow where the tasksequence is created and look for the reference of the item that has to be picked. I recommend to use the datatype treenode, because the item is somewhere in the model tree.
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