I have error when try to deploy sample shinyApp on shinyApp.io.
The error written is "Error building fastmap (1.0.1). R version 4.0.0 currently unavailable."
For detail, i attached the error. Can you give me the reason and how to handle it.
Preparing to deploy application...DONE
Uploading bundle for application: 2214771...DONE
Deploying bundle: 3084160 for application: 2214771 ...
Waiting for task: 723695378
error: Building package: fastmap
################################ Begin Task Log ################################
################################# End Task Log #################################
�G���[: Unhandled Exception: Child Task 723695379 failed: Error building image: Error building fastmap (1.0.1). R version 4.0.0 currently unavailable.