exec-maven-plugin.version is not set in examples pom.xml

Downloaded apache-servicemix

http://www.apache.org/dyn/closer.lua/servicemix/servicemix-7/7.0.0.M2/apache-servicemix-7.0.0.M2.zip

When running "mvn install" maven command in the examples directory getting following error.

Resolving expression: '${exec-maven-plugin.version}': Detected the following recursive expression cycle in 'exec-maven-plugin.version': [exec-maven-plugin.version] ->
Resolving expression: '${maven-scala-plugin.version}': Detected the following recursive expression cycle in 'maven-scala-plugin.version': [maven-scala-plugin.version]
Resolving expression: '${exec-maven-plugin.version}': Detected the following recursive expression cycle in 'exec-maven-plugin.version': [exec-maven-plugin.version] ->
Resolving expression: '${maven-scala-plugin.version}': Detected the following recursive expression cycle in 'maven-scala-plugin.version': [maven-scala-plugin.version]

values are not set for "exec-maven-plugin.version" and "maven-scala-plugin.version" properties