BO 4.1 Promotion Job Pending

hi gurus,

I create a promotion job and add some reports in it. But after I click promote, nothing happened.

The history of the job remains Pending.

The Last Run of the job remains NULL. The job doesn't run at all.

I checked the status of the servers containing the Promotion Management Services and the Promotion Management Scheduling Services.

They are working fine.

What could be the problem's root cause?

we are using BO 4.1 SP7.

Thank you!

Chong