configuration maven 3

hi, i want to install maven3 and when i execute this Command "mvn archetype:create -DgroupId=testapp -DartifactId=testapp" i receive this error: Code: Select all[ERROR] No plugin found for prefix 'archetype' in the current project and in the plugin groups [org.mortbay.jetty, org.apache.maven.plugi

instalation maven 3

hi, i want to install maven3 and when i execute this Command "mvn archetype:create -DgroupId=testapp -DartifactId=testapp" i receive this error: Code: Select all[ERROR] No plugin found for prefix 'archetype' in the current project and in the plugin groups [org.mortbay.jetty, org.apache.maven.plugi