Unable to connect to remote mysql database

Hi all, I am trying to connect wappler to a remote mySQL database using the instructions at https://github.com/Wappler/docs/wiki/Connecting-to-a-Database. I’m running v1.7.3 on Ubuntu 18.04LTS.

When I attempt create a database connection, I get the error “Invalid target configuration! Check your web server URL and the connectivity to it.” and see the following debug output in Wappler:

Start upload for dmxConnections/dmxDatabase.php
cd ok, cwd=/html
lftp: FileCopy.cc:876: virtual int FileCopyPeerFA::Do(): Assertion `!session->IsOpen()’ failed.
Uploaded /dmxConnections/dmxDatabase.php successfully

I have set up a PHP project with a SFTP target and the Test Connection button reports “Connection Successful!”. I am also able to upload files to the web server directory /var/www/html outside of Wappler using a SFTP client.

Is there any way of getting some further debug info from Wappler so I can work out what is going wrong?

Thanks!