Solution
This issue can be resolved by providing fully qualified name of the subVI to
VI name input of the Open VI Reference as illustrated below:
![full name](/servlet/rtaImage?eid=ka03q000001EF97&feoid=00N0Z00000HEWRt&refid=0EM3q000001nYia)
Image below shows where to obtain the fully qualified name of a VI given that the VI is store within an application (
.gcomp) or a namespace.