I understand now.  It is recommended to use sys.dm_tran_locks, instead of sys.syslockinfo.

However, I tried granting rights to sys.dm_tran_locks and I still received the same error message. 

Thanks!

I created an application role named testit.

Then I executed:

Grant select on sys.syslockinfo to testit

However, I still receive the message

"The user does not have permission to perform this action", if I...