About connect to the SSH Server with your wodSSH (General questions)

Hi,
I am using your product wodSSH in Delphi 7.0, but I find a problem that when I use the method connect provided by the component(I have set all properties including user, password and so on), I could connect the SSH server successfully with about 90 percentage,but sometimes I fail to connect,the error message is shown,which is saying your system didn't provide string presentation of the error, I can not find out the reason,so I want to sak me, and I would be appreciated if you could answer my question.Thank you!