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?
“Hey! Listen!” ~ Navi
2013: [x] MCTS 70-680
2014: [x] 22-801 [x] 22-802 [x] CIW Web Foundation Associate
2015 Goals: [] 70-410


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