With Xcode 12.5 RC1 released this week, the build now succeeds, but the we get a failing error when trying to open the Preview:
RemoteHumanReadableError: Failed to update preview.
Error encountered when sending 'previewInstances' message to agent.
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| RemoteHumanReadableError
|
| LoadingError: failed to load library at path "/Users/mthole/Library/Developer/Xcode/DerivedData/DuplicateTasksOnPreview-bkclfnyhkfofwaaulhpstpdjggqb/Build/Intermediates.noindex/Previews/MyLibrary/Products/Debug-iphonesimulator/PackageFrameworks/MyLibrary_-71ED4B7C0CDEC55C_PackageProduct.framework/MyLibrary_-71ED4B7C0CDEC55C_PackageProduct": Optional(dlopen(/Users/mthole/Library/Developer/Xcode/DerivedData/DuplicateTasksOnPreview-bkclfnyhkfofwaaulhpstpdjggqb/Build/Intermediates.noindex/Previews/MyLibrary/Products/Debug-iphonesimulator/PackageFrameworks/MyLibrary_-71ED4B7C0CDEC55C_PackageProduct.framework/MyLibrary_-71ED4B7C0CDEC55C_PackageProduct, 0): Library not loaded: @rpath/NewRelic.framework/NewRelic
| Referenced from: /Users/mthole/Library/Developer/Xcode/DerivedData/DuplicateTasksOnPreview-bkclfnyhkfofwaaulhpstpdjggqb/Build/Intermediates.noindex/Previews/MyLibrary/Products/Debug-iphonesimulator/PackageFrameworks/MyLibrary_-71ED4B7C0CDEC55C_PackageProduct.framework/MyLibrary_-71ED4B7C0CDEC55C_PackageProduct
| Reason: image not found)
MichaelT
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I've run into a similar (same?) issue, but for me it started with Xcode 12.5 RC1 https://developer.apple.com/forums/thread/678635
Filed FB9085841. I also see https://developer.apple.com/forums/thread/676670 which looks similar.