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When saving a few of my materials i get this message, any ideas? I've looked over the graphs and can't get any clues on something there.
Is your Substance version up to date, current version is 11.3.3.
If so, does the error give you a node ID?
If so try searching for that ID in Filter (click on the magnifying glass at the top of the graph window). Use 'Filter by' 'All' and 'Containing text or variable' enter the ID here
It turns out it was some old downloaded function .sbsar existing in the materials, i haven't spent time investigating what exactly was wrong in it but after removing it the materials were fine.
Glad to hear it's sorted for you.