Check you pdb file and see if the chain identifier A occurs at different places in the file. Pdb2gmx expects a chain to be continous, and if it isn't, it gets confused. If you have several chains, rename them accordingly.

Cheers
/Per


Annie Albin wrote:

Dear all,

I faced a problem in the pdb2gmx step as i got this following error message,
"Fatal error:
Chain identifier 'A' was used in two non-sequential blocks (residue 908, atom 7013)"

As I'm pretty new to this field. I'm finding it difficult to troubleshoot. Any suggestions would be of great help.
Thank you,
Annie Albin.

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Per Larsson
PhD Student
Stockholm Bioinformatics Center
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