Created Unassigned: Start-PsFCIV throws error with .NET 2.0 [38]

Method invocation failed because [System.Security.Cryptography.SHA1CryptoServiceProvider] doesn't contain a method named 'Dispose'.
At C:\Users\multifront-build\Desktop\PsFCIV_2.1.ps1:241 char:18
+ $hasher.Dispose <<<< ()
+ CategoryInfo : InvalidOperation: (Dispose:String) [], RuntimeException
+ FullyQualifiedErrorId : MethodNotFound

the error occurs, because Dispose method is implemented in .NET 4.0