Unable to export data

[SARuiner]

Describe the bug:
When trying to export data for backup purposes, the application states "An error occurred. No such interface supported". An empty file is created and doesn't contain any data.

This has worked in the past.

To Reproduce:
Steps to reproduce the behavior:

1. Open CryptoTracker
2. Click on "Portfolio"
3. Click on "Export"
4. Click on "Save" (used default name. There is no file currently there to overwrite/replace)
5. See error message

Expected behavior:
A file placed on my hard drive with the extension .ct that contains data. There is a file that is created, however it is empty.

Screenshots:
2 screenshots attached