# First pdb file contains multiple forms of the same residue

**URL:** <https://ask.bioexcel.eu/t/first-pdb-file-contains-multiple-forms-of-the-same-residue/3242>\
**Category:** HADDOCK\
**Created:** [September 10, 2021, 8:30am UTC](https://ask.bioexcel.eu/t/first-pdb-file-contains-multiple-forms-of-the-same-residue/3242 "2021-09-10T08:30:55Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Kashaf](https://avatars.discourse-cdn.com/v4/letter/k/f9ae1b/32.png) [@Kashaf](https://ask.bioexcel.eu/u/Kashaf)\
**Post date:** [September 10, 2021, 8:30am UTC](https://ask.bioexcel.eu/t/first-pdb-file-contains-multiple-forms-of-the-same-residue/3242/1 "2021-09-10T08:30:55Z")

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Hi, I just submitted my protein-protein docking job at guru interface but it returned this error. What does it mean? How do I remove it? Please help

**Error message**

**First pdb file contains multiple forms of the same residue. This is not supported in the current form. If you would like to supply multiple conformations, please create an ensemble**  
**ATOM 1277 CA AGLN E 493 -39.920 30.982 7.452 0.50 62.36 C**

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**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:** [September 10, 2021, 9:04am UTC](https://ask.bioexcel.eu/t/first-pdb-file-contains-multiple-forms-of-the-same-residue/3242/2 "2021-09-10T09:04:22Z")

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The forum is searchable… usually a good idea to search a bit before posting a question 🙂

A search with the error message will return many hits:

[https://ask.bioexcel.eu/search?context=topic&context\_id=3242&q=multiple%20forms%20of%20the%20same%20residue&skip\_context=true](https://ask.bioexcel.eu/search?context=topic&context_id=3242&q=multiple%20forms%20of%20the%20same%20residue&skip_context=true)