Error while saving attachment - Unable to create target directory

[Meera]

I am trying to upload attachment to an issue using REST API. 

Here's the error message I have received while doing the upload.

500 Internal Server Error: Got error while saving attachment CRQ-164330.txt: Got exception while saving attachment in attachment store. Exception: Unable to create target directory /var/atlassian/application-data/jira/data/attachments/CRQ/170000/CRQ-164330

Not sure why this is caused? Any help would be appreciated. 

[Sebastian Kleinholz · Accepted solution]

Is it possible that the process running Jira has not the permissions to create files/directories at /var/atlassian/application-data/jira/data/attachments ?

Are there any attachments in the folder CRQ/ ?

Can you attach files with the browser to the same issue?

[Meera]

Yes, it is not allowing to attach files to browser either. 

[Nic Brough -Adaptavist-]

It's what Sebastian says then - check permissions and ownership of the files and directories in the home and installation directories for your Jira (usually if one of them is wrong, a lot of them are)