I was trying to import the dataontap module onto a few of our Hyper-V nodes in a cluster and got an error that said "'Could not load file or assembly System.Runtime.Serialization, Version=3.0.0.0,"
I was able to solve the issue by installing .NET 3.5
I would suggest upating the module manifest, "dataontap.psd1" to specify the required version of .NET using
"DotNetFrameworkVersion = '3.5' " in the manifest hashtable