Adding multiple SSH keys generated using Open-SSH in the Source Tree

[sanketcs30]

Hi, I have created two bitbucket accounts and created two SSH keys using Open-SSH agent, now how to add multiple private SSH keys generated into the source tree as source tree only takes only one SSH key and even after specifying proper SSH key in the SSH key configuration [Source tree ---> Options ---> SSH key configuration] , it's giving following error how to resolve the error:- 

"ssh-agent failed with code -1": SystemNullReferenceException: Object reference not set to an instance of object

Also this error is showing when I click on the launch ssh agent button [Source tree ---> Tools ---> Launch SSH Agent

What is the cause of this error and please provide the solution to resolve this error



Thanks