This problem can occur if there are Property Nodes that references a Front Panel Object on the program. Real-Time Targets do not allow Front Panel objects, so the Property Node is not able to find the object they are referenced to. This error inhibits the network stream communication. If your intention is to deploy a program containing Network Stream Communication as an RTEXE to your Real-Time Target, do not use Property Nodes that reference the Front Panel.
Example of Front Panel Object.
Example of Property Node Referencing a Front Panel Object.