can anyone please help me to find out the solution.
Thing is like The SHAOnline files are executed sucsessfully without any errors individually.But while running main file, those files throws errors!!
Try with the following selector -
<html title='SHA1 online' />
Make sure SHA online page is opened. Here, BOT is not finding that screen.
Check you workflow if you are closing the SHA1 Online browser window before triggering the Close Applications.XAML
If you are closing, please remove that activity. Then it works.
Hey @Anju_Sekharan
The point is here the main error is in your initialization Workflow not with any other workflow.
So it is directly going to close state where you have defined to attach and close Chrome browser windows which your bot never opened.
Regards…!!
Aksh
But there is no error showing in initialization workflow
Hey @Anju_Sekharan
I just refereed your Uploaded screenshot and can see there System Error. and might be because of this your transition to close state is happening 
Just Run your workflow in Debug and check
Regards…!!
Aksh