I'm having problems when I deploy my app because the MCDM library is used in the code and the following appears:

Preparing to deploy document...DONE
Uploading bundle for document: 5825163...Warning: 
* May be unable to deploy package dependency 'MCDM'; could not
   determine a repository URL for the source 'CRAN'.

* Unable to determine the source location for some packages. Packages
   should be installed from a package repository like CRAN or a version
   control system. Check that options('repos') refers to a package
   repository containing the needed package versions.

DONE
Deploying bundle: 6140003 for document: 5825163 ...
Waiting for task: 1193998344
  building: Building image: 7157259
  building: Installing system dependencies
  building: Fetching packages
  building: Installing packages
  building: Installing files
  building: Pushing image: 7157259
  deploying: Starting instances
  unstaging: Stopping old instances
Document successfully deployed to https://....shinyapps.io/...

Therefore, the deploy is even done, but when I access the website, it gives an error.

What can I do to fix it?