Unable to set up an API call through the Plugins page

I have been trying to connect an API to Bubble but I have this error message as a notification:

There was an issue setting up your call.

Raw response for the API
Status code 500

500 Internal Server Error

Internal Server Error

The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.

I’m only setting up a cURL call as an action, making a POST call to an ngrok link, and setting up a text field as a parameter.