When developing a maven project with Eclipse IDE for Java EE Developers , the error Could not calculate build plan: Plugin org.apache.maven.plugins:maven-resources-plugin:2.6 or one of is reported; solution:
1. View the location of .m2 in the settings.xml file of windows -> Preferences -> maven
2. Then delete all the folders in the .m2/repository/org/apache/maven/plugins directory
3. Select the maven project, right click--"maven--"update to let maven re-download the dependency package
problem solved
[Note] This IDE comes with a maven plug-in, so you don’t need to download and install the maven plug-in yourself