Using .dll file in Ax batch class through x++ code

I have added a Assembly SshNet.dll  in references in Ax 2012 and i placed the .dll file to the client bin folder.

I ran the code through class having the Runs on Property set to Called from and it worked fine.

But when i changed the Runs on Property to Server after placing the .dll file to server's bin folder as i need to run the code in batch system it gives me below mentioned error :-

Assembly containing type "xxx" is not referenced.

Object 'CLRObject' could not be created.

Kindly let me how to fix this issue.

Thanks in advance.