I am having the same error on a brand new install on MacBook Air 2018 1,6 ghz, i5 dual. 8G. after switching from iPod touch 7 to iPhone 11 and while the iPhone preview was preparing I realize that my Sophos antivirus was working like crazy. It took a while but the preview started working in iPhone 11. I went back to iPod touch 7 preview and it was still not working. Only some previews are problematics.
bgagnon
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Québec, QC