This error may occur when using the AlteryxGraph device. The reason for this is that the AlteryxGraph device creates a pipe between Alteryx and R. If creating graphs in a loop, a pipe has to be created for each loop which slows down the processing. As a result, Alteryx ends up trying to create the next graph before the previous one is completed. To avoid this, it is best practice when creating multiple graphs within a loop to keep the AlteryxGraph device statement outside of the loop.
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