Please take the following steps to replicate the issue.
1. Fresh install GeoDirectory
2. Set up as usual
3. Download Sample CSV from the list
4. Add some categories manually.
5. Save File
6. Select and Upload file
7. File upload successfully
8. On the file, text box error showing as follows
Array( [error] => Sorry, this file type is not permitted for security reasons.)x
To open a new support ticket, first select the relevant forum and then click the "New Post" button. Example: You need support for the core plugin? Click on Core Plugin support and click on the "New Post" Button.