Dear All, I have got the error in the end of trajectory converting: "Magic Number Error in XTC file (read -335790888, should be 1995)" trjconv -s md-1.tpr -f md-300ns-wat.xtc -o md_CA.pdb -n index_8pro.ndx -pbc mol -ur compact -center -skip 1000 Is there anybody know what`s the error about? Many thanks in advance. Jennifer