Cycle in dependencies between targets 'Material' and 'Motion'; building could produce unreliable results.

[Garretming]

When I use use_modular_headers! in Podfile ,pod 'Material' ,i got this error.
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Cycle in dependencies between targets 'Material' and 'Motion'; building could produce unreliable results.
Cycle path: Material → Motion → Material
Cycle details:
→ Target 'Material' has a command with output '/Users/test/Library/Developer/Xcode/DerivedData/snack-cdujtgzquuqznrefmfahomuccaiw/Build/Products/UAT_α-iphoneos/Material/libMaterial.a'
○ Target 'Material' has target dependency on Target 'Motion'
→ Target 'Motion': Ditto /Users/test/Library/Developer/Xcode/DerivedData/snack-cdujtgzquuqznrefmfahomuccaiw/Build/Products/UAT_α-iphoneos/Motion/Motion.swiftmodule/Project/armv7.swiftsourceinfo /Users/test/Library/Developer/Xcode/DerivedData/snack-cdujtgzquuqznrefmfahomuccaiw/Build/Intermediates.noindex/Pods.build/UAT_α-iphoneos/Motion.build/Objects-normal/armv7/Motion.swiftsourceinfo
○ Target 'Motion' has compile command for Swift source files
○ That command depends on command in Target 'Motion': script phase “Copy generated compatibility header”
○ Target 'Motion': SwiftMergeGeneratedHeaders /Users/test/Library/Developer/Xcode/DerivedData/snack-cdujtgzquuqznrefmfahomuccaiw/Build/Intermediates.noindex/Pods.build/UAT_α-iphoneos/Motion.build/DerivedSources/Motion-Swift.h /Users/test/Library/Developer/Xcode/DerivedData/snack-cdujtgzquuqznrefmfahomuccaiw/Build/Intermediates.noindex/Pods.build/UAT_α-iphoneos/Motion.build/Objects-normal/arm64/Motion-Swift.h /Users/test/Library/Developer/Xcode/DerivedData/snack-cdujtgzquuqznrefmfahomuccaiw/Build/Intermediates.noindex/Pods.build/UAT_α-iphoneos/Motion.build/Objects-normal/armv7/Motion-Swift.h
○ Target 'Motion' has compile command for Swift source files