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Unable to convert classes into dex format.,Unable to convert classesinto dex format
I use IronSource monitization and when I trying to build my project but see the following error:
CommandInvokationFailure: Unable to convert classes into dex format. E:\2018.4.18f1\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\OpenJDK\Windows\bin\java.exe -Xmx4096M -Dcom.android.sdkmanager.toolsdir="C:\Program Files (x86)\Android\android-sdk\tools" -Dfile.encoding=UTF8 -jar "E:\2018.4.18f1\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\sdktools.jar" -
stderr[ warning: Ignoring InnerClasses attribute for an anonymous inner class (cn.com.wali.basetool.io.a) that doesn't come with an associated EnclosingMethod attribute. This class was probably produced by a compiler that did not target the modern .class file format. The recommended solution is to recompile the class from source, using an up-to-date compiler and without specifying any "-target" type options. The consequence of ignoring this warning is that reflective operations on this class will incorrectly indicate that it is not an inner class.