Hello Manju,
Since I have not had a look at the workflow you have built, I will not be able to give you a definitive answer.But, I would recommend you check the following:
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Ensure your Robot is connected to Orchestrator. In the Robot Setting window must show the Status as Connected, licensed
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Pass the following arguments to InitAllSettings.xaml (Yes, the default arguments will do their job if you have not altered anything.But, just to be sure). Also ensure you pass the Config (Global Variable) as input argument to InitAllApplications.xaml
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Ensure you keep the Assets of type Credential in the Settings sheet of Config.xlsx & all the single valued assets (Bool,Integer & Text) in Assets Sheet.
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Create the asset in Orchestrator and if it’s a Path to a file/application which is not within the project folder, then ensure you place the full path without any quotes.
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Refer the following diagram if you have any confusion about how to use in_Config(“”).ToString in the workflow or what to name the Orchestrator Asset
Kudos 
Hope this helps !
Regards,
Nithin Prabhu
ashokkarale