Deploy modbus I/O server as part of custom device build

Question

Hello,
We are attempting to get Modbus up and running as a custom device. From Labview we have managed to get modbus communication working by using Modbus IO servers.
When I package this with the custom device build we get the following error code when reading the bound variable:
(0x8BBB0005)
General Description: 
LabVIEW: Unable to locate variable in the Shared Variable Engine. Deployment of this variable may have failed.
I am starting to worry if it is even possible to deploy the Modbus IO server together with the custom device? Any suggestions for other approaches?
Best regards,
Jørgen

Answer 1

Thanks for your replies. 
The Network Variable Engine is activated on the RT target. 
I now tried to create programmatically the modbus IO server by using the Express VI. This, however, will not allow me to deploy the system definition file, as it reports that it is missing a .vi. 
I have then tried to convert it to a regular .vi and bundle it with both the configuration and engine build specs, but the same message appears. 
Am I misunderstanding how the .vi dependencies are managed by the build specifications? Or do I have to use something else than the express .vi to create the modbus IO.
Best Regards,
Jørgen
EDIT: Added the error message: 
The VeriStand Gateway encountered an error while deploying the System Definition file.
Details:
Error 1003 occurred at Project Window.lvlibroject Window.vi >> Project Window.lvlib:Command Loop.vi >> NI_VS Workspace ExecutionAPI.lvlib:NI VeriStand - Connect to System.vi
Possible reason(s):
LabVIEW: The VI is not executable. This error may occur because the VI is either broken or contains a subVI that LabVIEW cannot locate. Select File>>Open to open the VI and verify that you can run it.
As soon as I remove the usage of the express.vi, it deploys just fine.