Export CSV

Not sure what I am doing wrong because I have used CSV Export many times before, however this time I am using docker, so not sure if it changes everything but, I set my path to the user uploads directory which is /public/travel-images/ and when the export tries to run i get

{
    "status": "500",
    "code": "EISDIR",
    "message": "EISDIR: illegal operation on a directory, open '/opt/node_app/public/travel-images'",
    "stack": "Error: EISDIR: illegal operation on a directory, open '/opt/node_app/public/travel-images'"
}

If anyone knows what I am doing wrong, please help.