Trouble with Dl4jMlpClassifier

Morning. I'm trying to classify images. I've created an ARFF file using
.ImageDirectoryLoader with the result being:

@relation image_dataset

@attribute image_path string
@attribute class numeric
@data
21906c17ad24ecbf62536c097c1ec684.jpg,3
68291db7341eb2b7d2dcea7ed5f4122d.jpg,90
f51eb63bbb92b77c89422d9fd2cb976f.jpg,40
.
.
.

I open that file using explorer;
1. select Dl4jMlpClassifier as the classifier
2. and select .ImageInstanceIterator as the iterator and select the folder
that has the images
3. leave pretty much all other as defaults

When I try to run it in the explorer I get:
Attribute isn't nominal, string or date

When I try to run the command line it stops with the following output:
java.io.NotSerializableException:
weka.classifiers.functions.Dl4jMlpClassifier$1
        at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1185)
        at
java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553)
        at
java.base/java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:442)
        at
weka.classifiers.functions.Dl4jMlpClassifier.writeObject(Dl4jMlpClassifier.java:437)
        at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native
Method)
        at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:566)
        at
java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1145)
        at
java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1497)
        at
java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
        at
java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
        at
java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349)
        at weka.core.SerializedObject.<init>(SerializedObject.java:93)
        at weka.core.SerializedObject.<init>(SerializedObject.java:72)
        at
weka.classifiers.AbstractClassifier.makeCopy(AbstractClassifier.java:104)
        at
weka.classifiers.evaluation.Evaluation.evaluateModel(Evaluation.java:1591)
        at weka.classifiers.Evaluation.evaluateModel(Evaluation.java:668)
        at
weka.classifiers.AbstractClassifier.runClassifier(AbstractClassifier.java:141)
        at
weka.classifiers.functions.Dl4jMlpClassifier.main(Dl4jMlpClassifier.java:325)


Any assistance appreciated.

Thanks
/paul

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