Deployment Error using WithSpinner function



I am trying to deploy an App to and get the attached error. I understand the error is because of the function "WithSpinner" (part of the Package "shinycssloaders" which shows a loading screen while the result is being fetched ), but i really need the loading screen because it is a long running script and it takes some time to execute and bring up the results. Is there something that i need to do to get rid of the attached error? Please advise.