Nimble Studio File Transfer: Unable to obtain Database lock

This is a command-line/terminal error that can occur on a machine trying to run Nimble Studio File Transfer (NSFT) commands. This is caused due to another instance of NSFT already running. 

To resolve this, check if GUI of NSFT is running on the machine. Quit the GUI of NSFT and re-run the upload/download commands from command-line/terminal.