Class not found errors on 2.5.9

[Blake McBride]

Greetings,

I have a system that has been using Groovy 2.4.15 and works fine.  I am
attempting to upgrade to Groovy 2.5.9.

My Gradle build contains the line:  compile group: 'org.codehaus.groovy',
name: 'groovy-all', version: '2.5.9'

Now, when I run my app, I get:

java.lang.NoSuchMethodError:
org.apache.groovy.util.SystemUtil.getSystemPropertySafe(Ljava/lang/String;)Ljava/lang/String;

java.lang.NoClassDefFoundError: Could not initialize class
org.codehaus.groovy.control.CompilerConfiguration

Any help would sure be appreciated.

Thanks!

Blake McBride