1. File conflict problem (Multiple commands produce)
Multiple commands produce '/Users/XX/Library/Developer/Xcode/DerivedData/Ble_Car-davkwupkdpvravbroathtuojnyhv/Build/Products/Debug-iphonesimulator/XXX.app/Info.plist'
Solution: Find the conflicting files in the project and delete one or rename the duplicate files
2.Undefined symbols for architecture x86_64
Undefined symbol: _OBJC_CLASS_$_AVAudioSession
Undefined symbol: _AVAudioSessionInterruptionNotification
Undefined symbol: _AVAudioSessionCategoryPlayAndRecord
Undefined symbol: _AVAudioSessionInterruptionTypeKey
Undefined symbol: _AVAudioSessionCategoryPlayback
Solution: Add library frameworks BuildSettings -> Build Phase -> Link Binary with libraries