Crashing in Shapeshift - possibly needs updating to newer Files?

[andypiper]

When I try to run Shapeshift, it is failing in Xgen:

Fatal error: Error raised at top level: Xgen failed to generate. Underlying error: Failed to create folder: file /AppleInternal/BuildRoot/Library/Caches/com.apple.xbs/Sources/swiftlang/swiftlang-1103.8.25.8/swift/stdlib/public/core/ErrorType.swift, line 200
[1]    97317 illegal hardware instruction  shapeshift Swifter -icloud

Additionally, when compiling Shapeshift, it reports:

...Shapeshift/.build/checkouts/Files/Sources/Files.swift:596:10: warning: unexpected version number in 'available' attribute for non-specific platform '*'
        @available(*, deprecated: 1.4.0, renamed: "creatingFolderFailed")
         ^                      ~~~~~~~

[4/4] Linking Shapeshift

This leads to me suspect Files is the underlying cause, but I'm uncertain how to update Xgen to use a newer version of Files (or whether indeed that would help to resolve the issue here)