# Swift 5.4 on Windows: error: missing required modules: 'CFXMLInterface', 'CoreFoundation' **URL:** \ **Category:** Standard Library\ **Tags:** windows\ **Created:** [May 19, 2021, 1:34am UTC](https://forums.swift.org/t/swift-5-4-on-windows-error-missing-required-modules-cfxmlinterface-corefoundation/48575 "2021-05-19T01:34:21Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![compnerd](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/compnerd/32/2165_2.png) [@compnerd](https://forums.swift.org/u/compnerd)\ **Post date:** [May 19, 2021, 4:44am UTC](https://forums.swift.org/t/swift-5-4-on-windows-error-missing-required-modules-cfxmlinterface-corefoundation/48575/2 "2021-05-19T04:44:53Z")
[[SR-14578] Unable to import FoundationXML on Windows - Swift](https://bugs.swift.org/browse/SR-14578) It's a known issue, that has been fixed for a while, but the change accidentally didn't make it into 5.4. This should be fixed in the 5.5 snapshots, and I hope that we may be able to pull in the fix in a dot-release for 5.4. As to why the problem exists: CoreFoundation is not meant to be public, and the Windows port has generally been far more aggressive about preventing leakage of internal interfaces and encouraging cross-compilation. --- _[View the full topic](https://forums.swift.org/t/swift-5-4-on-windows-error-missing-required-modules-cfxmlinterface-corefoundation/48575)._