release:prepare - You don't have a SNAPSHOT project in the reactor projects list.

Sometimes during executing mvn release:prepare following error ocures:

[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.995s
[INFO] Finished at: Fri Feb 21 11:19:01 CET 2014
[INFO] Final Memory: 11M/241M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-release-plugin:2.3.2:prepare (default-cli) on project cubiculus-ldraw: You don't have a SNAPSHOT project in the reactor projects list. -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-release-plugin:2.3.2:prepare (default-cli) on project [project-name]: You don't have a SNAPSHOT project in the reactor projects list.

In other words it say that your pom.xml file is not in SNAPSHOT version (for example 1.4-SNAPSHOT) but contains release version (for example 1.4.3). One to the reasons of this problem could be that previous attempt to release project failed and during it's work changed project version to release version. Check your repository that there is correct SNAPSHOT versions and synchronise repo. In case of SVN "svn revert -R ."