What's the meaning of this error?
SwiftPM fetches repos failing with all nightly docker images
Computing version for https://github.com/mongodb/swift-bson.git
37
error: target 'bson' referenced in product 'bson' could not be found; valid targets are: ''
38
error: target 'bson' referenced in product 'bson' could not be found; valid targets are: ''
39
error: target 'bson' referenced in product 'bson' could not be found; valid targets are: ''
40
error: target 'bson' referenced in product 'bson' could not be found; valid targets are: ''
41
error: target 'bson' referenced in product 'bson' could not be found; valid targets are: ''
42
error: target 'bson' referenced in product 'bson' could not be found; valid targets are: ''
43
error: target 'libbson' referenced in product 'libbson' could not be found; valid targets are: ''
44
error: target 'bson' referenced in product 'bson' could not be found; valid targets are: ''
45
error: target 'bson' referenced in product 'bson' could not be found; valid targets are: ''
46
error: target 'bson' referenced in product 'bson' could not be found; valid targets are: ''
47
error: target 'bson' referenced in product 'bson' could not be found; valid targets are: ''
48
error: target 'libbson' referenced in product 'libbson' could not be found; valid targets are: ''
49
error: target 'libbson' referenced in product 'libbson' could not be found; valid targets are: ''
50
error: target 'libbson' referenced in product 'libbson' could not be found; valid targets are: ''
51
error: target 'libbson' referenced in product 'libbson' could not be found; valid targets are: ''
52
Computed https://github.com/mongodb/swift-bson.git at 3.0.2 (1.48s)
53
Fetching https://github.com/swift-extras/swift-extras-base64
54
Fetching https://github.com/swift-extras/swift-extras-json
55
Fetched https://github.com/swift-extras/swift-extras-json (0.21s)
56
Fetched https://github.com/swift-extras/swift-extras-base64 (0.21s)
57
Computing version for https://github.com/swift-extras/swift-extras-base64
58
error: fatalError in https://github.com/swift-extras/swift-extras-base64