Hi Amira,
Does your project work when you disable the obfuscation step of ProGuard using -dontobfuscate?
Since Spark is written in Scala, can you try keeping the Scala attributes as my colleague James explained in a different topic, here.
-keepattributes Exceptions,InnerClasses,Signature,Deprecated,SourceFile,LineNumberTable,*Annotation*,EnclosingMethod,MethodParameters,ConstantValue,Module,ModulePackages,LocalVariableTable,LocalVariableTypeTable,Scala*
If that didn’t work either, can you please provide us with a sample that recreates the issue?
Kind regards,
Jonas