vcluster Memory Allocation

I am trying to run
vcluster data.txt 16 -clabelfile=clabelfile.txt -rlabelfile=rlabel.txt -rclassfile=.class.txt -showtree -showfeatures -showsummaries=itemsets -sim=corr -clmethod=rbr

and I get
***Memory allocation failed for Cluster2Matrix: crowval. Requested size: 894532500 bytes

data.txt has #Rows: 16000, #Columns: 21555, #NonZeros: 2527136

If I use -sim=cos, it completes without any issues. I am running vcluster on a node that has 48GB memory so it should be enough. Is there any way to avoid memory allocation problem?

Thank you