[gmx-users] Magic number error

[minnale]

Hi Users, 
     I have run the protein simulation for 9ns, with 1ns each time by using tpbconv *command, after converting all9ns .trr files to .xtc i have deleted all .trr files. Later I have catenated all the 9ns simulation files by using trjcat command. Now I want restart my simulation, so  
when I used trjconv command for getting 9th ns .trr file its showing following error

The command i have given 
 trjconv -f 9ns_all.xtc -s 9ns_prot.tpr -o 9ns_tpbout.trr -b 8000 -e 9000 
 
 Program trjconv, VERSION 3.3.1
Source code file: xtcio.c, line: 83

Fatal error:
Magic Number Error in XTC file (read -1727167416, should be 1995)
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I have searched in list archives one person suggested(http://www.mail-archive.com/gmx-users@gromacs.org/msg08375.html) change version to 3.2, iam using 3.3.1
The way iam doing is doing wrong?
Could you give me any suggestion 
Thanks alot in advance
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