problem when combine grm parts generated by --make-grm-part

Hello,

I want to use GCTA to generate a grm for UKBiobank data. I generated 200 parts for each chromosome, so in total I got 200*22 grm parts. 

Then I combine grms using following order:
First, I combine grms for all chromosomes, for example, I combine all grm-part 1 from chr1-chr22 use --mgrm. And I end up with 200 grm parts.
Second, I combine those 200 grm parts using the codes provided in the Manu:

    cat test.part_200_*.grm.id > test.grm.id
    cat test.part_200_*.grm.bin > test.grm.bin
    cat test.part_200_*.grm.N.bin > test.grm.N.bin


Everything works until here. Thanks for adding this useful new feature to generate grm by parts!

Problem appears from here. My final goal is to select all family clusters using --grm-singleton 0.4. However, it gives me error message that The GRM id and GRM binary is not matching [test]

The code I use is /gcta64 --grm test --grm-singleton 0.4 --out testing

Above code works if I try with each single part instead of the whole combined grm.



I would really appreciate if anyone can help me with this.

Thanks a lot,
Bowen