Related to "Pending Execution"

I am reading Mail and calling BOT as per condition.

Conditions are depending on Email Sender and email Subject Content.

Bot Structure is like :

1) Ream Unread Mail

2) Checking sender

If sender has permission(checking emailid in CSV file) then proceed otherwise proceeding to other steps ( skipping 3rd Step)

3) Checking Email Content

If Email Subject is Text_1 --> task Bot_1 ( 2 child BOTS)

If Email Subject is Text_2 --> task Bot_2

If Email Subject is Text_3 --> task Bot_3

If Email Subject is Text_5 --> task Bot_5

If Email Subject is Text_6 --> task Bot_6

If Email Subject is Text_7 --> task Bot_7

When I schedule BOT without step 3 It execute smoothly

But When I scheduling BOT with step 3 ( 9 BOTS) then It will show status as Pending Execution in Activity--> In progress

I am attaching screenshot shows "Pending Execution"

BOT agent version : 21.121

with Automation 360 build 11513

Thanks In Advance