Dear All,

I have written a perl script to create a new xtd  file, loop over each frame, copy the contents  to a temporary document,  delete the atoms that I don't want from the  temporary document and  append it to the new new trajectory and repeat  for all frames,when I check  it syntax, it is OK.

But while running, it has something wrong

How to deal with this problem?

Thanks.

Best regards,

                                                                                            Yours

                                                                                                CHENG Xu