CI tests failing with "Could not compute signing task inputs"

My CircleCI workflow has started failing with an error I can't seem to find any documentation for:

Could not compute signing task inputs - operation was cancelled.

... and then a reference to a 3rd party library's product, eg.: (in target 'Appboy_iOS_SDK_AppboyKit' from project 'Appboy_iOS_SDK').

I'm using SPM to manage dependencies and I'm trying to modularize my Xcode project by adding a local SPM package.

Below is the relevant part of the CircleCI output. I can't seem to figure out what these errors are referring to and they don't seem to occur when I remove UI tests from the scheme, so I'm assuming this has something to do with the "Copy Bundle Resources" step of the "MyAppUITests" target.

Any help would be much appreciated.

Xcode version: 12.5.1

[00:00:45]: Running Tests: ▸ Touching MyApp.app (in target 'MyApp' from project 'MyApp')
[00:00:45]: ▸ Build Succeeded
[00:00:45]: ▸ 2021-07-22 00:00:45.521 xcodebuild[1629:69156] [MT] DVTAssertions: Warning in /Library/Caches/com.apple.xbs/Sources/IDEFrameworks/IDEFrameworks-18212/IDEFoundation/Testing/IDETestRunSpecificationBuilder.m:678
[00:00:45]: ▸ Details:  Failed to compute path to baseline file during test run spec construction: <XCTHTestRunSpecification: 0x7fa5036121a0>
[00:00:45]: ▸ Object:   <IDETestRunSpecificationBuilder>
[00:00:45]: ▸ Method:   +testRunSpecificationsForTestingSpecifiers:scheme:buildables:withBuildParameters:additionalEnvironmentVariables:additionalCommandLineArguments:testRerunPolicy:includeClangProfileParameters:shouldDebugAppExtensions:error:
[00:00:45]: ▸ Thread:   <NSThread: 0x7fa4f9618f70>{number = 1, name = main}
[00:00:45]: ▸ Please file a bug at https://feedbackassistant.apple.com with this warning message and any useful information you can provide.
[00:00:45]: ▸ 2021-07-22 00:00:45.526 xcodebuild[1629:69156] [MT] DVTAssertions: Warning in /Library/Caches/com.apple.xbs/Sources/IDEFrameworks/IDEFrameworks-18212/IDEFoundation/Testing/IDETestRunSpecificationBuilder.m:678
[00:00:45]: ▸ Details:  Failed to compute path to baseline file during test run spec construction: <XCTHTestRunSpecification: 0x7fa50305bb20>
[00:00:45]: ▸ Object:   <IDETestRunSpecificationBuilder>
[00:00:45]: ▸ Method:   +testRunSpecificationsForTestingSpecifiers:scheme:buildables:withBuildParameters:additionalEnvironmentVariables:additionalCommandLineArguments:testRerunPolicy:includeClangProfileParameters:shouldDebugAppExtensions:error:
[00:00:45]: ▸ Thread:   <NSThread: 0x7fa4f9618f70>{number = 1, name = main}
[00:00:45]: ▸ Please file a bug at https://feedbackassistant.apple.com with this warning message and any useful information you can provide.
[00:00:45]: ▸ 2021-07-22 00:00:45.531 xcodebuild[1629:69156] [MT] DVTAssertions: Warning in /Library/Caches/com.apple.xbs/Sources/IDEFrameworks/IDEFrameworks-18212/IDEFoundation/Testing/IDETestRunSpecificationBuilder.m:678
[00:00:45]: ▸ Details:  Failed to compute path to baseline file during test run spec construction: <XCTHTestRunSpecification: 0x7fa50306a230>
[00:00:45]: ▸ Object:   <IDETestRunSpecificationBuilder>
[00:00:45]: ▸ Method:   +testRunSpecificationsForTestingSpecifiers:scheme:buildables:withBuildParameters:additionalEnvironmentVariables:additionalCommandLineArguments:testRerunPolicy:includeClangProfileParameters:shouldDebugAppExtensions:error:
[00:00:45]: ▸ Thread:   <NSThread: 0x7fa4f9618f70>{number = 1, name = main}
[00:00:45]: ▸ Please file a bug at https://feedbackassistant.apple.com with this warning message and any useful information you can provide.
[00:00:45]: ▸ 2021-07-22 00:00:45.536 xcodebuild[1629:69156] [MT] DVTAssertions: Warning in /Library/Caches/com.apple.xbs/Sources/IDEFrameworks/IDEFrameworks-18212/IDEFoundation/Testing/IDETestRunSpecificationBuilder.m:678
[00:00:45]: ▸ Details:  Failed to compute path to baseline file during test run spec construction: <XCTHTestRunSpecification: 0x7fa503076680>
[00:00:45]: ▸ Object:   <IDETestRunSpecificationBuilder>
[00:00:45]: ▸ Method:   +testRunSpecificationsForTestingSpecifiers:scheme:buildables:withBuildParameters:additionalEnvironmentVariables:additionalCommandLineArguments:testRerunPolicy:includeClangProfileParameters:shouldDebugAppExtensions:error:
[00:00:45]: ▸ Thread:   <NSThread: 0x7fa4f9618f70>{number = 1, name = main}
[00:00:45]: ▸ Please file a bug at https://feedbackassistant.apple.com with this warning message and any useful information you can provide.
[00:00:45]: ▸ 2021-07-22 00:00:45.549 xcodebuild[1629:69156] [MT] DVTAssertions: Warning in /Library/Caches/com.apple.xbs/Sources/IDEFrameworks/IDEFrameworks-18212/IDEFoundation/Testing/IDETestRunSpecificationBuilder.m:678
[00:00:45]: ▸ Details:  Failed to compute path to baseline file during test run spec construction: <XCTHTestRunSpecification: 0x7fa503660a10>
[00:00:45]: ▸ Object:   <IDETestRunSpecificationBuilder>
[00:00:45]: ▸ Method:   +testRunSpecificationsForTestingSpecifiers:scheme:buildables:withBuildParameters:additionalEnvironmentVariables:additionalCommandLineArguments:testRerunPolicy:includeClangProfileParameters:shouldDebugAppExtensions:error:
[00:00:45]: ▸ Thread:   <NSThread: 0x7fa4f9618f70>{number = 1, name = main}
[00:00:45]: ▸ Please file a bug at https://feedbackassistant.apple.com with this warning message and any useful information you can provide.
[00:00:45]: ▸ 2021-07-22 00:00:45.555 xcodebuild[1629:69156] [MT] DVTAssertions: Warning in /Library/Caches/com.apple.xbs/Sources/IDEFrameworks/IDEFrameworks-18212/IDEFoundation/Testing/IDETestRunSpecificationBuilder.m:678
[00:00:45]: ▸ Details:  Failed to compute path to baseline file during test run spec construction: <XCTHTestRunSpecification: 0x7fa50366c6a0>
[00:00:45]: ▸ Object:   <IDETestRunSpecificationBuilder>
[00:00:45]: ▸ Method:   +testRunSpecificationsForTestingSpecifiers:scheme:buildables:withBuildParameters:additionalEnvironmentVariables:additionalCommandLineArguments:testRerunPolicy:includeClangProfileParameters:shouldDebugAppExtensions:error:
[00:00:45]: ▸ Thread:   <NSThread: 0x7fa4f9618f70>{number = 1, name = main}
[00:00:45]: ▸ Please file a bug at https://feedbackassistant.apple.com with this warning message and any useful information you can provide.
[00:00:51]: ▸ ❌  error: Could not compute signing task inputs - operation was cancelled. (in target 'Appboy_iOS_SDK_AppboyKit' from project 'Appboy_iOS_SDK')
[00:00:51]: ▸ ❌  error: Could not compute signing task inputs - operation was cancelled. (in target 'Appboy_iOS_SDK_AppboyUI' from project 'Appboy_iOS_SDK')
[00:00:51]: ▸ ❌  error: Could not compute signing task inputs - operation was cancelled. (in target 'Mixpanel_Mixpanel' from project 'Mixpanel')
[00:00:52]: ▸ Testing failed:
[00:00:52]: ▸ 	Could not compute signing task inputs - operation was cancelled.
[00:00:52]: ▸ 	Testing cancelled because the build failed.
[00:00:52]: ▸ ** TEST FAILED **```

Replies

same problem here