cluster command hangs up

Hello Everyone,
I have used mothur cluster commnad before but now when I am using it is not going forward any more. It runs for few minutes and then hangs up, it never finishes. I am using this commnad:
mothur > cluster(phylip=…/demultiplexed.filter.phylip.dist, method=furthest)

its just stays like this for hours and never get finished /------------------------------------------------------------/ Running command: cluster.classic(phylip=../demultiplexed.filter.phylip.dist, precision=100, method=furthest, hard=T, sim=F) ********************#****#****#****#****#****#****#****#****#****#****# Reading matrix: |||||||||||||||||||||||||||||||||||||||||||||||||||| ***********************************************************************
Please let me know where I am going wrong. I have around 25000 sequencs.


Is that 25000 unique sequences? If so, running them through cluster.classic will probably take a verrrryyyyyyyyy long time. Why not follow the SOP and only unique.sequences, pre.cluster, chimera.uchime and the appropriate cutoffs? It will likely go much faster