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YAML build pipeline. An item with the same key has already been added

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Agreeable Ant answered on September 27, 2020 Popularity 1/10 Helpfulness 1/10

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YAML build pipeline. An item with the same key has already been added

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The error message "An item with the same key has already been added" typically occurs in a YAML build pipeline when there are duplicate keys in your YAML file. YAML does not allow duplicate keys in a map (dictionary) structure, which can lead to unexpected behavior or errors during the parsing process.

How to Fix This Issue
Identify Duplicate Keys: Check your YAML file for any keys that appear more than once within the same level.

Remove or Rename Duplicates: Decide whether to remove or rename the duplicate keys based on your requirements.

Example
Here’s a simplified example illustrating how this error can occur and how to resolve it:

Problematic YAML Example
yaml
Copy code
steps:
  - script: echo "Step 1"
  - script: echo "Step 2"
  - script: echo "Step 1"  # This key is a duplicate
Fixed YAML Example
yaml
Copy code
steps:
  - script: echo "Step 1"
  - script: echo "Step 2"
  - script: echo "Step 3"  # Renamed to avoid duplication
Tips for Avoiding Duplicate Keys
Use a YAML Validator: Online YAML validators can help you identify syntax errors, including duplicate keys.
Consistent Naming: Use a consistent naming convention for keys to minimize the chances of duplicates.
Modular Structure: If your YAML file is long or complex, consider breaking it into smaller, more manageable sections.
By ensuring that each key is unique within its context, you can avoid this error in your YAML build pipeline. If you have a specific YAML configuration you’d like help with, feel free to share!

Popularity 1/10 Helpfulness 1/10 Language c

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Tags: c key yaml

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Contributed on Oct 23 2024

Agreeable Ant

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YAML build pipeline. An item with the same key has already been added

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If you run this you get the error 
An item with the same key has already been added azure devops pipeline.

After trying many things I found out that it is not possible to have jobnames
with spaces in it. Removing the spaces resolved the error. 
However, this does not resolve this issue because this issue is about 
having a better error message that gives a clue on what is wrong 
which of course is a minimum requirement on error reporting.

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Source: developercommunity.visualstudio.com

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Contributed on Nov 24 2022

Vast Vendace

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snake

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there is a 99% chance you are not supposed to be here.

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Contributed on May 13 2021

Helpless Hummingbird

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snake

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Stop playing snake and code you lazy fuck.

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Contributed on Mar 13 2021

Bright Baboon

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snake

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STOP PLAYING SNAKE AND GET BACK TO WORK

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Contributed on Oct 28 2020

Embarrassed Echidna

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snake

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its a snake what did you a expect? a wiener!

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Contributed on Dec 08 2020

Colorful Cardinal

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snake

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This is for inspiration ;)

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Contributed on May 26 2021

Muddy Mosquito

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snake

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game.players.Playeradded:Connect:Function(Hit)

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Contributed on Sep 27 2020

Glamorous Gibbon

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snake

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Stop playing snake and code...

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Contributed on Jan 12 2023

ThatOnePerson

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snake

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Contributed on Jan 16 2023

Mo Mo

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snake

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Don't !

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Contributed on Apr 08 2022

JBTheOneAndOnly

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YAML build pipeline. An item with the same key has already been added

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