Issue with manual assembly process

I am trying to model a manual assembly process, where products move one at a time from each of the 3 storage totes to the empty tote (2nd from left), however, I cannot figure out the issue, despite this process being quite similar to working process in my model, the errors in the output tab are persistent and include,(where node 8 is the node which receives the product): Process Node #11::ProcessExecutor::Flyers Tote::Transport Out error: Product’s Flyer state within its flow sequence is lost.
Process Node #10::ProcessExecutor::Grip Seal Labels Tote::Transport Out error: Product’s Flyer state within its flow sequence is lost.
Process Node #9::ProcessExecutor::Grip Seal Bag Tote::Transport Out error: Product’s Grip Seal Bag state within its flow sequence is lost.
Process Node #8::ProcessExecutor::Flyer Label insert::Transport In error: Process variable with name “ProductIn” and value type “Ref” or “List” not found.

The 3 first errors mean there is something wrong in your Flow. Maybe check if you have all your steps in the Flow Editor

The last error mean there is something wrong in a TransportIn statement in the process “Flyer Label Insert”, maybe check if you used the variable name “ProductIn” everywhere to refer to this product or assembly?