serializability java Matlab parfor

I use a toolbox written in Java javaplex https://github.com/javaplex/javaplex.github.io whene i use it with a for loop i dont hava any error, but whene i use it with a parfor loop to do parallel computing

parfor i=1:10 maColonne = mat(i,:); intervals= Calcul_interval(maColonne,options,max_dimension, max_filtration_value, num_divisions) intervals multinterval{i}= intervals; end

i have this error is not serializablethe class that causes it, is intervals, this is a code of the class https://github.com/appliedtopology/javaplex/blob/master/src/java/edu/stanford/math/plex4/homology/barcodes/Interval.java

I do not understand why i have this error "is not serializable" whereas this class implement the java.io.Serializable; !! have you any idea please