I am having the same issue. This is Apple's walk of shame for creating a mediocre SSD's for their OSX.
128GB? Really? Fire whom ever decided that 128GB SSD is enough for anything ...
My solution is/was relocating/removing Applications and Items from your OSX Hard drive just long enough to download XCode, then move XCode to an external HDD and update the Path. Return all the Items you relocated or removed.
This Worked for me before, now I am having to redo the whole thing again. :(
waelio
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