Issue install .NET3.5 in Windows Server 2012

Using windows server add role feature to install .net3.5 framework in server 2012 has an issue in one of the wizard steps as it prompt me:
Do you need to specify an alternate source path?...missing source file on destination

weird...seems like a defeat in the wizard.

Solution is to use the CD with command prompt to execute it.
Insert the windows server 2012 disk into CDrom, example (d:)

Type following command in command prompt:
dism /online /enable-feature /featurename:NetFX3 /all /Source:d:\sources\sxs /LimitAccess

This solved my problem.