This is not an error, but rather a warning to let you know that one or more spring hangers are not supporting the pipe. This could happen if a nearby vertical restraint, such as a +Y is interfering with the hanger design in the weight-only case, causing the pipe to lift off at the hanger location. I would run the model and review the Hanger Table w/Text to see which hanger(s) show a zero load. Then go back to your input and either remove the hanger entirely, or relocate nearby vertical restraints as both are not needed.
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Loren Brown
Director of Technical Support
CADWorx & Analysis Solutions
Intergraph Process, Power, & Marine
12777 Jones Road, Ste. 480, Houston, TX 77070 USA