prefilter died

[unknow1024]

I am using the uniref50 as the querydb,which splits in 100 pieces to use,and using uniclust30 as the targetdb(i use the mmseqs createdb to deal with its hhsuite version in ffdata file,is it right?or maybe exists something wrong) When i use the command mmseqs search querydb targetdb res tmp ,the error prefilter died has come.