Does not work in Pentaho 8.1

[codek]

2018-10-16 08:41:53,568 INFO  [org.pentaho.di] 2018/10/16 08:41:53 - PurRepository - Creating repository meta store interface
2018-10-16 08:41:53,599 INFO  [org.pentaho.di] 2018/10/16 08:41:53 - [install files]._install_files - Dispatching started for transformation [_install_files]
2018-10-16 08:41:53,646 ERROR [org.pentaho.di] 2018/10/16 08:41:53 - [processRules (cpk.executeAtStart)].[_process Rules].List Endpoints.0 - ERROR (version 8.1.0.0-SNAPSHOT, build 8.1.0.0-SNAPSHOT from 2018-09-17 11.29.04 by codek) : Unable to load the mapping transformation because of an error : java.lang.RuntimeException: Endless loop detected for substitution of variable: ${rules.dir}
2018-10-16 08:41:53,661 ERROR [org.pentaho.di] 2018/10/16 08:41:53 - [processRules (cpk.executeAtStart)].[_process Rules].List Endpoints.0 - ERROR (version 8.1.0.0-SNAPSHOT, build 8.1.0.0-SNAPSHOT from 2018-09-17 11.29.04 by codek) : java.lang.RuntimeException: Endless loop detected for substitution of variable: ${rules.dir}
2018/10/16 08:41:53 - [processRules (cpk.executeAtStart)].[_process Rules].List Endpoints.0 - 	at org.pentaho.di.core.util.StringUtil.substitute(StringUtil.java:154)

[dmcwhinnie]

Pull request #12 fixed it for me