found the solution here!!
https://forum.uipath.com/t/issue-with-the-take-screenshot-activity-in-unattended-mode-caused-due-to-the-server-manager-popup/364491
Anil_G
ashokkarale
jinal.shah
Gautham_Pattabiraman
postwick
chandreshsinh.jadeja
vrdabberu
Ajay_Mishra
sven.wullum1
Vyshnavi_Nalumachu