Swarm Error Message...does not connect to nodes

Please look at this error message and tell me what it means? Rendering does not connect to nodes and my image ends up like a checkerboard of missing bucket information.
Vray 3.7 for Revit
Revit 2018
Windows Pro 64 Bit
NVidea P4000
32 gb memory

Thanks for your assistance.
Gregg

It’s hard to tell from the screenshot why the SWARM nodes are not starting to render.
You can check if the license settings are correctly set - V-Ray Swarm

Also - you can navigate in your internet browser to the log page of a certain SWARM node - for example http://192.168.16.21:24267/log and check if an error will be listed after you start a render (you can post a screenshot if there in an error).