Issues switching from Server 2012 r2 core to core with the gui

So as the title states I am having issues getting my server core to upgrade to the mid-level with GUI. It says unable to download source, even with the disk inserted and pointing the install to use that disk.
Any ideas?
Any ideas?
--
“Hey! Listen!” ~ Navi
2013: [x] MCTS 70-680
2014: [x] 22-801 [x] 22-802 [x] CIW Web Foundation Associate
2015 Goals: [] 70-410
“Hey! Listen!” ~ Navi
2013: [x] MCTS 70-680
2014: [x] 22-801 [x] 22-802 [x] CIW Web Foundation Associate
2015 Goals: [] 70-410
Comments
Coretech Blog » Blog Archive » Why I can’t convert my Windows Server 2012 R2 Core to GUI
The mind is the limit. As long as the mind can envision the fact that you can do something, you can do it, as long as you really believe 100 percent. - Arnold Schwarzenegger
I could see it being this, but I don't believe I had done any updates to it. I know I have the command correct LeifAlire, just fyi. I am not bad with powershell.
“Hey! Listen!” ~ Navi
2013: [x] MCTS 70-680
2014: [x] 22-801 [x] 22-802 [x] CIW Web Foundation Associate
2015 Goals: [] 70-410
“Hey! Listen!” ~ Navi
2013: [x] MCTS 70-680
2014: [x] 22-801 [x] 22-802 [x] CIW Web Foundation Associate
2015 Goals: [] 70-410