an error occured while trying to write to the entity.
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Which error?
codeblog.jonskeet.uk/.../
while debugging of the process model,I am getting an error occured while trying to write to the entity in process model.
Would you please post the exact error message.
I think the error message is clear. You do not pass any data into the node. Check the node config and also whether the used process variable has the expected value.