updating Maven indices error

I get these errors trying to update the indices for a Maven repository:

java.lang.RuntimeException: java.io.FileNotFoundException: Resource nexus-maven-repository-index.properties does not exist

and this

Caused by: java.lang.RuntimeException: org.apache.maven.wagon.ResourceDoesNotExistException: File: http://my-artifactory/artifactory/build-repo/.index/nexus-maven-repository-index.properties , ReasonPhrase:Not Found.

I searched online but didn't find anything that helped.  I am running Intellij community v. 16.