Not enough space for command

Hello Duplicati users,
I’m running Duplicati on a Windows 7 Pro 64 SP1 French
I’m testing Duplicati at the command line and I receive an error in french which translate as “not enough space for command”. This error message appens randomly in several circumstances, with several commands.
After some (many, in fact) attempts, I finaly found that this error appens when you misspell a command, or if you cut and paste a command line whith a blank line or a CR-LF in the end.
I hope it will help other users saving time.
Goog backups to you all.