Unable to add Samba Export

When I try to create a samba export, I get this error:

Error!

Unknown internal error doing a POST to /api/samba

If you need more help on this issue, email us at support@rockstor.com with the following information: •The error message: Unknown internal error doing a POST to /api/samba
•A step by step description of the actions leading up to the error.
•Download the tarred and zipped server logs by clicking here, and attach it to the email.