Warning or error when trying to create an issue in Jira

[KT]

As of recently, it seems, when we try to Create an issue, the warning

"Some issue types are unavailable due to incompatible field configuration and/or workflow associations."

is displayed.

From reading as much as I can here and elsewhere, it seems like this is a fairly common issue with Jira, but on the other hand I don't believe I changed anything, especially recently, that would cause this. To be honest I don't feel I know enough about customizing Jira at this point that I should be able to cause some configuration issue.

Also recently — and I don't know if it's related, but it seems like it started happening at the same time — we've become unable to create an issue using the Jira mobile app (on Android) at all. The error in that case is:

"Can't create the issue in this project. Try a different project."

Except there is no different project. And this, also, is something that used to work.

Does either of these things — or particular the combination of the two — suggest somewhere I should start looking?

Some additional information:

I can create, it seems, a "Task" or an "Epic" using Jira Mobile for Android, but anything else — "Bug", "Improvement", or "New Feature" — gives me the "Can't create the issue..." error.

[KT · Accepted solution]

I was able to resolve the mobile issue, at least in my case, by clearing all data for the Jira app and re-adding the project.

(As for the the warning when creating an issue via web, Jira support has told me not to worry about it. Which seems somewhat less ideal than getting rid of the warning.)

[iai]

I have the same problem.

"Can't create the issue in this project. Try a different project."

I had the same error message when tried to create a task on a particular project. Creating bug or epic works. This started to happen recently that is  about the same time that OP posted above.

I have many projects. Only a couple of projects have this issue.  

[iai]

I reinstalled my Android Jira app and the issue was solved.