I have tried moving sff_extract file to mira/bin/ /usr/local/bin but I am still facing error . How to get it working? [dc103@hpc orig_data]$ cat flx_linker.fa >linker_flx ATAACTTCGTATAATGTATGCTATACGAAGTTAT [dc103@hpc bin]$ pwd /home/dc103/apps/mira/bin/ [dc103@hpc bin]$ ls -l total 62716 -rwxr-xr-x 1 dc103 dc103 4632800 Dec 11 13:11 caf2caf -rwxr-xr-x 1 dc103 dc103 4632800 Dec 11 13:11 caf2fasta -rwxr-xr-x 1 dc103 dc103 4632800 Dec 11 13:11 caf2gbf -rwxr-xr-x 1 dc103 dc103 4632800 Dec 11 13:11 caf2html -rwxr-xr-x 1 dc103 dc103 4632800 Dec 11 13:11 caf2tcs -rwxr-xr-x 1 dc103 dc103 4632800 Dec 11 13:11 caf2text -rwxr-xr-x 1 dc103 dc103 4632800 Dec 11 13:11 convert_project -rwxr-xr-x 1 dc103 dc103 1340968 Dec 11 13:11 fastatool -rwxr-xr-x 1 dc103 dc103 4632800 Dec 11 13:11 gbf2caf -rwxr-xr-x 1 dc103 dc103 4632800 Dec 11 13:11 gbf2fasta -rwxr-xr-x 1 dc103 dc103 4673800 Dec 11 13:11 mira -rwxr-xr-x 1 dc103 dc103 4673800 Dec 11 13:11 miraclip -rwxr-xr-x 1 dc103 dc103 4673800 Dec 11 13:11 miramem -rwxr-xr-x 1 dc103 dc103 4673800 Dec 11 13:11 miraSearchESTSNPs -rwxr-xr-x 1 dc103 dc103 1867624 Dec 11 13:11 scftool -rwxrwxr-x 1 dc103 dc103 52349 Dec 14 09:50 *sff_extract* -rwxr-xr-x 1 dc103 dc103 227081 Dec 14 11:06 *ssaha2* -rwxr-xr-x 1 dc103 dc103 104389 Dec 14 11:06 *ssaha2Build* [dc103@hpc bin]$ cd - /home/dc103/CP_Data/orig_data [dc103@hpc orig_data]$ ls check_for cp_454.fasta cp_454.fasta.qual cp_454.xml flx_linker.fa linker.fasta out_8k_ONE.fa out_res_check.fa res_check.fa sff_extract [dc103@hpc orig_data]$ ~/apps/mira/bin/sff_extract -o cp_454 -a -l flx_linker.fa -i "insert_size:8000, insert_stdev:1000" /home/dc103/CP_Data/sff_lf/GSMQLLJ01.sff [Errno 22] Invalid argument Regards, Ganga Jeena