Unable to Enable: Sync LDAP Groups Option

God Morning to Everyone.
i am very new in this forum sorry for any mistake.

i have setup Rocket chat where Users are only allowed to login from one group. base DN i have given root Directory but user search is only from one group, this is only to control users.

now my requirment is to MAP LDAP groups with Rocket chat group. problem is when i click on Sync LDAP Groups to enable this page shows blank white page and nothing works. am i doing something wrong ??
rest of this setup is workign fine. only i want to enable to to automate group members synchronization, please help

My Running Rocket chat Server Details :
Rocket.Chat Version: 2.4.1
NodeJS Version: 8.11.4 - x64
MongoDB Version: 4.0.13
MongoDB Engine: wiredTiger
Platform: linux
Process Port: 3000
ReplicaSet OpLog: Enabled
Commit Branch: HEAD

A blank page is encountered on UI when trying to enable Sync LDAP group option from admin console