1. Double-click on the error message in the Error panel to go to the box.
  2. Be sure there is no infinite loop in the flow. The flow cannot close and infinite loops are not supported, the flow cannot close and infinite loops are not supported, be sure there is no infinite loop in the flow […]
  3. Check if the data type connection is valid. Due to multi-typed boxes, the type of some connections can be determined only on runtime.