SSH Key file not found, probably config error in the SSH config file.
First check the default.cfg file in the SSH installation folder (c:\program files\inventu\viewer\SSH\Config) look for the "keyfilename = fvrsa.pvt" and check it has fvrsa.pvt as the setting.
The folder C:\Program Files\inventu\viewer\ssh\keys should contain file fvrsa.pvt, fvrsa_open.pub and fvrsa_ssh2.pub files.