Sometimes errors in the clustering steps are related to the process running out of memory. Does the job run to completion on a smaller test set of rows? If so, you can try to allocate more memory to the node in the node's advanced settings. This could also point to something in the data (like a control character) causing problems too.
If a smaller set of data doesn't remove the error, you might selectively remove clustering rules to see if one in particular is causing problems. This shouldn't be a problem so if you find this is the case, I suggest you initiate a technical support track.
Ron
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