[Dup] Blue Brick Appearing, Preventing Building

I would have shown a screenshot, but I had an error show shortly after. Upon clearing a foundation area where a bugged building was, I found that a transparent blue block appeared and would only allow me to remove or start the building operation. I tried both, but was unable to complete either. Shortly after i was taken to the desktop and prompted with this error.

      "Assertion Failed:
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A post was merged into an existing topic: Assertion error develop 2494