# Haddock server problem

**URL:** https://ask.bioexcel.eu/t/haddock-server-problem/591
**Category:** HADDOCK
**Created:** [November 2, 2017, 2:06pm UTC](https://ask.bioexcel.eu/t/haddock-server-problem/591 "2017-11-02T14:06:16Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![mtrellet](https://dub1.discourse-cdn.com/flex013/user_avatar/ask.bioexcel.eu/mtrellet/32/42_2.png) [@mtrellet](https://ask.bioexcel.eu/u/mtrellet)
#### Post date: [November 2, 2017, 2:48pm UTC](https://ask.bioexcel.eu/t/haddock-server-problem/591/2 "2017-11-02T14:48:30Z")

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Hello,

Thank you for your message.  
The issue is that your PDB file seems to contain residues with double occupancy, that HADDOCK cannot handle in its current version. Except if the residues concerned are really important, you can easily clean your PDB for any double occupancy by running the `pdb_delocc.py` present in our [PDB-tools repository](https://github.com/haddocking/pdb-tools). Another script, `pdb_format.py` will help you detecting any other formatting issue your PDB might have.

I hope this will help you,

Best,  
Mikael

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