While using FAS application launch fails with error "Cannot start app <Application Name>"

Application launch fails with error "Cannot start app ", Event ID 1 and 28 are logged on Storefront servers. Event ID: 1 Description: The Federated Authentication Server at: returned a server error: 1 for method AssertIdentity...

Event ID: 0 & Event ID:1 - Citrix Store cannot be created or added

Unable to create or add a store. Event ID: 0 & Event ID:1 Checking the event viewer on the Storefront server gives the following events- Also, unable to browse an existing store. "The webpage cannot be found."...