UnsupportedOperationException: This is supposed to be overridden by subclasses

[DamienCassou]

$ java -cp lib/commons-codec-1.6.jar:lib/commons-logging-1.1.1.jar:lib/fluent-hc-4.2.2.jar:lib/httpclient-4.2.2.jar:lib/httpclient-cache-4.2.2.jar:lib/httpcore-4.2.2.jar:lib/httpmime-4.2.2.jar:android-checkin-1.0.jar:/home/cassou/.m2/repository/com/google/protobuf/protobuf-java/2.5.0/protobuf-java-2.5.0.jar com.android.checkin.Main XXX@gmail.com XXX
Fetching auth (google service)...
SID=BAD_COOKIE
LSID=BAD_COOKIE
Auth=XXX
Checking in...
Using MEID:      XXX
Using Serial:    XXX
Using Mac Addr:  XXX
Using LoggingId: XXX
java.lang.UnsupportedOperationException: This is supposed to be overridden by subclasses.
    at com.google.protobuf.GeneratedMessage.getUnknownFields(GeneratedMessage.java:180)
    at com.android.checkin.proto.Logs$AndroidBuildProto.getSerializedSize(Logs.java:2071)
    at com.google.protobuf.CodedOutputStream.computeMessageSizeNoTag(CodedOutputStream.java:749)
    at com.google.protobuf.CodedOutputStream.computeMessageSize(CodedOutputStream.java:530)
    at com.android.checkin.proto.Logs$AndroidCheckinProto.getSerializedSize(Logs.java:338)
    at com.google.protobuf.CodedOutputStream.computeMessageSizeNoTag(CodedOutputStream.java:749)
    at com.google.protobuf.CodedOutputStream.computeMessageSize(CodedOutputStream.java:530)
    at com.android.checkin.proto.Checkin$AndroidCheckinRequest.getSerializedSize(Checkin.java:705)
    at com.google.protobuf.AbstractMessageLite.toByteArray(AbstractMessageLite.java:62)
    at com.android.checkin.Checkin.generateCheckinPayload(Checkin.java:166)
    at com.android.checkin.Checkin.doCheckin(Checkin.java:355)
    at com.android.checkin.Checkin.checkin(Checkin.java:56)
    at com.android.checkin.Main.main(Main.java:17)