API REST returns Error null creating a subtask

Dear Sirs,

I’m trying to create tasks and subtasks using the API REST on JIRA JIRA v6.2.3. It seems to works fine for Tasks, but  not for subtasks. For subtasks creation JIRA always returns "Error al crear la incidencia: null" without more explanations.

I checked necessary fields on subtask, id of subtask exists, etc. Tried to do not provide some of the parameters on the creation JSON subtask request and in all cases returns an explanation message about what is missing, but when it seems that all parameters are informed and ready to create a subtasks it fails an returns error null and status 400 Bad Request.

 Here is the JSON request and response I used for subtask creation

            "key": "IMM"
            "key": "IMM-5310"
        "summary": "Sub-task of IMM-5310",
        "description": "Don't forget to do this too.",
            "id": "19"
    "errorMessages": [
        "Error al crear la incidencia: null"
    "errors": {}



Thanks in advance!!

1 answer

I'm just starting to get this problem now as well.


I have an automated system that creates a series of tasks and sub-tasks, and it's worked just fine for weeks, but today it fails with a "Bad Request" 400 error.


Nothing on my end has changed.

Suggest an answer

Log in or Join to answer
Community showcase
Sarah Schuster
Posted Jan 29, 2018 in Jira

What are common themes you've seen across successful & failed Jira Software implementations?

Hey everyone! My name is Sarah Schuster, and I'm a Customer Success Manager in Atlassian specializing in Jira Software Cloud. Over the next few weeks I will be posting discussion topics (8 total) to ...

3,203 views 13 19
Join discussion

Atlassian User Groups

Connect with like-minded Atlassian users at free events near you!

Find a group

Connect with like-minded Atlassian users at free events near you!

Find my local user group

Unfortunately there are no AUG chapters near you at the moment.

Start an AUG

You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs

Groups near you
Atlassian Team Tour

Join us on the Team Tour

We're bringing product updates and pro tips on teamwork to ten cities around the world.

Save your spot