Hi, 

Could I just comment that this is an unhelpful error message for when you don't tick the "seed-to-voxel" option in the set up tab.  Spent several hours trying to figure out what part of the setup data was missing until it dawned on me that I hadn't selected the correct Ready to run pipeline.  Pretty stupid of me I know (was testing and wanted to reduce processing time), but also posting in case someone else has this issue in the future.  

"Not ready to start Denoising step.  Please complete the Setup step first (Fill any required information and press "Done" in the Setup tab.)