Android build errors

[Former user]

Hi，when i build apk for android, i got these errors, Unity2018.2.4f1, Uduino 2.1.8. Could you please help me to slove this issue? Thank you

Assets/Uduino/Scripts/Boards/Finder/UduinoConnection.cs(22,32): error CS0246: The type or namespace name UduinoConnection_AndroidBluetoothLE' could not be found. Are you missing an assembly reference? Assets/Uduino/Scripts/Boards/Finder/UduinoConnection.cs(24,32): error CS0246: The type or namespace nameUduinoConnection_AndroidSerial' could not be found. Are you missing an assembly reference? Error building Player because scripts had compiler errors Build completed with a result of 'Failed' UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr) UnityEditor.BuildPlayerWindow+BuildMethodException: 3 errors at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (BuildPlayerOptions options) [0x0021f] in /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPlayerWindowBuildMethods.cs:187 at UnityEditor.BuildPlayerWindow.CallBuildMethods (Boolean askForBuildLocation, BuildOptions defaultBuildOptions) [0x0007f] in /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPlayerWindowBuildMethods.cs:94 UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)