how to remove password of bitlocker

Hi I tried yesterday to lock my pendrive and didnt's like it so i presed the "remove the password and the response was

 "the password is the only way to unlock this drive.add another method before removing the password".So i was worried and I pressed "automatically unlock this drive on this computer" then again i pressed remove the password and it was removed.But I am sorry that I was unable to find the way to completely remoce bit locker so I could not do beyond this.
Now your bitlocker window will be seen as

But there will be still a problem as i mentioned I faced problem when I pressed "turn off automatic unlocking this drive on this computer". it gave the following error

I did what I was able to do.If you find its solution please give it in comments.