Mix phx.server failing after upgrading to phoenix 1.5.0-rc.0

I also ran into that issue. I tried first to comment the line related to LiveReloader (within the block if code_reloading? do ... end) in endpoint.ex file. Server started without issue. When I commented back the issue came back.
I think I ran mix deps.clean phoenix_live_reload && mix deps.update phoenix_live_reload to make it work.

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