Dreambox DM7000 error 127

I have installed the dropbear 0.48 plugin in dreambox DM7000.
I can connect remotely without a problem.
Hoewever, when I attempt to edit a file on remote server
i.e. dreambox, I receive following error:

Cannot execute SCP to start transfer. Please make sure that SCP is installed on the server and path to it is included in PATH. You may also try SFTP instead of SCP.
Command failed with return code 127.

Please help

Well for a beginning I cannot suggest you anything else than the error message does.