# Error in ligand

**URL:** <https://ask.bioexcel.eu/t/error-in-ligand/1960>\
**Category:** HADDOCK\
**Created:** [April 27, 2020, 8:35am UTC](https://ask.bioexcel.eu/t/error-in-ligand/1960 "2020-04-27T08:35:57Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Leo](https://avatars.discourse-cdn.com/v4/letter/l/c2a13f/32.png) [@Leo](https://ask.bioexcel.eu/u/Leo)\
**Post date:** [April 27, 2020, 8:35am UTC](https://ask.bioexcel.eu/t/error-in-ligand/1960/1 "2020-04-27T08:35:57Z")

</div>

For my ligand PDB file, I get the error message “Second pdb file contains multiple residues with number 0 in chain”.

The pdb file is set as one residue (0) but I´ve tried changing the residue number. I think the problem is within the third columns (HETATM annotation) because all carbons are annotated the same. Am I correct in that assumption and how would I in that case fix it?

[TSBresonancefinalChembio3Dultra.pdb](https://ask.bioexcel.eu/uploads/short-url/woVgQL0lqOTJGLJldoGzD3ts9PJ.pdb) (4.8 KB)

---

<div class="post-metadata">

**Author:** ![amjjbonvin](https://dub1.discourse-cdn.com/flex013/user_avatar/ask.bioexcel.eu/amjjbonvin/32/23_2.png) [@amjjbonvin](https://ask.bioexcel.eu/u/amjjbonvin)\
**Post date:** [April 27, 2020, 8:47am UTC](https://ask.bioexcel.eu/t/error-in-ligand/1960/2 "2020-04-27T08:47:23Z")

</div>

Yes all atom names must be unique.

---

<div class="post-metadata">

**Author:** ![Leo](https://avatars.discourse-cdn.com/v4/letter/l/c2a13f/32.png) [@Leo](https://ask.bioexcel.eu/u/Leo)\
**Post date:** [April 27, 2020, 9:51am UTC](https://ask.bioexcel.eu/t/error-in-ligand/1960/3 "2020-04-27T09:51:04Z")

</div>

Okey, thank you for answer.