Error invalid_input - Can't create new issue

[Husein Fadhlullah]

I’m trying to create a new issue in my project. 

I’m using this route to create new issue : https://naavee.atlassian.net/jira/software/c/projects/HAF/boards/1?selectedIssue=HAF-333https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-issue-fields/#api-rest-api-3-field-post

I've already fill out the summary, description, sprint, priority, label and asignee.

The problem I’m running into is that I’m receiving a INVALID_INPUT whenever I click the create button - i am the org admin in this project. 

Any recommendations on what I should be doing differently?

[Nic Brough -Adaptavist-]

That looks like a validator on the create transition has been written to throw you a pretty much useless validation message.  

I'd start with a look at the workflow.