why eclipse m2e error "add a version or custom suffix using name template in advanced settings"

In eclipse when I am trying to import a muti pom project from git or svn through the m2e plugin, it's giving me the error:

add a version or custom suffix using name template in advanced settings because of the project xxx already exists

I am sure some of the projects are not in the /workspace folder

What is Eclipse m2e settings?

This plugin synchronises the settings done in your project's Maven POM file with the Eclipse settings. All you need to provide is a JAR file with the settings files, and configure the maven-eclipse-plugin in your POM to use these settings.

You can use the "Advanced" option at bottom of import window, "Name template" select "[artifactId]-[version]","Profiles" fill the project name and version, eg:helloWord-0.0.1-SNAPSHOT

just test, and good luck