ExternalAxisTo(1, 90, "Joint") not working

[Codermads]

Hi, I was trying to control Yumi robot through Machina Bridge and i faced a problem in controlling the joint_7 of right arm of Yumi Robot. Though my other 6 joint worked perfectly fine through this command - ' AxesTo(0,0,0,0,0,0); ' , but i was unable to control joint_7 by giving the command - ' ExternalAxisTo(1, 90, "Joint") '. When i fed this command I got the error as
ERROR: Incorrect amount of parameters for "ExternalAxisTo", please use as " Boolean ExternalAxisTo ".

Then I actually just only fed - " ExternalAxisTo(1, 90) " - without "Joint" in the command, itseems the command worked because i saw green color for that command in queue, but the joint_7 didn't rotate to 90 degrees.

So then i tried giving the command " Boolean ExternalAxisTo " as specified in the error and gave the rotation degrees... etc to it, but still it didnt work.

Im currently using the latest version of Machina Bridge - v0.8.12e. Please sort out this error for me. Thankyou in advance.