Grails 2.3.1 not running

I have what looks to be exactly the same problem lamented here: Grails 2.3.0 Not Running

However none of the tenetative solutions had any effect.

When I attempt to run

grails clean --stacktrace

I get:

    | Environment set to development.
| Error Error executing script Clean: _GrailsClasspath_groovy$_run_closure1 (NOT
E: Stack trace has been filtered. Use --verbose to see entire trace.)
java.lang.NoClassDefFoundError: _GrailsClasspath_groovy$_run_closure1
        at _GrailsClasspath_groovy.run(_GrailsClasspath_groovy:39)
        at _GrailsClasspath_groovy$run.call(Unknown Source)
        at _GrailsEvents_groovy$run.call(Unknown Source)
        at org.codehaus.gant.IncludeTargets.leftShift(IncludeTargets.groovy:59)
        at org.codehaus.gant.IncludeTargets$leftShift.call(Unknown Source)
        at _GrailsEvents_groovy.run(_GrailsEvents_groovy:32)
        at _GrailsEvents_groovy$run.call(Unknown Source)
        at _GrailsClean_groovy$run.call(Unknown Source)
        at org.codehaus.gant.IncludeTargets.leftShift(IncludeTargets.groovy:59)
        at org.codehaus.gant.IncludeTargets$leftShift.call(Unknown Source)
        at _GrailsClean_groovy.run(_GrailsClean_groovy:29)
        at _GrailsClean_groovy$run.call(Unknown Source)
        at org.codehaus.gant.IncludeTargets.leftShift(IncludeTargets.groovy:59)
        at org.codehaus.gant.IncludeTargets$leftShift.call(Unknown Source)
        at Clean.run(Clean.groovy:25)
        at Clean$run.call(Unknown Source)
        at gant.Gant.prepareTargets(Gant.groovy:607)
Caused by: java.lang.ClassNotFoundException: _GrailsClasspath_groovy$_run_closur
e1
        ... 17 more
| Error Error executing script Clean: _GrailsClasspath_groovy$_run_closure1

Per the link that I refer to I tried:

deleting my application's target directory
deleting my home directory's .grails/.slcache
deleting my workspace's .metadata.plugins\org.grails.ide.eclipse.core\2.3.1.slcache

Before trying any of those I wiped my grails_home directory and replaced with a redownloaded copy of grails 2.3.1

Reverting Grails 2.1.5 also did not help

Nothing in the stack trace points to anything that I explicitly authored so I'm at a loss for what I might have done wrong.

I'm using/running:

64 bit java version 1.7.0_45
Groovy 2.1.9
Windows 7 Enterprise SP1, 64-bit OS

I have an arbitrary grails app that I created to refer to the BuidConfig that it refers to since I'm attempting to upgrade from Grails 2.1.5 and that runs

The full stack trace is:

    | Loading Grails 2.3.1
| Configuring classpath
| Configuring classpath.
| Environment set to development
| Environment set to development.
| Error Error executing script RunApp: _GrailsClasspath_groovy$_run_closure1
java.lang.NoClassDefFoundError: _GrailsClasspath_groovy$_run_closure1
    at _GrailsClasspath_groovy.run(_GrailsClasspath_groovy:39)
    at _GrailsClasspath_groovy$run.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
    at _GrailsEvents_groovy$run.call(Unknown Source)
    at org.codehaus.gant.IncludeTargets.leftShift(IncludeTargets.groovy:59)
    at org.codehaus.gant.IncludeTargets$leftShift.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
    at _GrailsEvents_groovy.run(_GrailsEvents_groovy:32)
    at _GrailsEvents_groovy$run.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
    at _GrailsClean_groovy$run.call(Unknown Source)
    at org.codehaus.gant.IncludeTargets.leftShift(IncludeTargets.groovy:59)
    at org.codehaus.gant.IncludeTargets$leftShift.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
    at _GrailsClean_groovy.run(_GrailsClean_groovy:29)
    at _GrailsClean_groovy$run.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
    at _GrailsWar_groovy$run.call(Unknown Source)
    at org.codehaus.gant.IncludeTargets.leftShift(IncludeTargets.groovy:59)
    at org.codehaus.gant.IncludeTargets$leftShift.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
    at _GrailsWar_groovy.run(_GrailsWar_groovy:27)
    at _GrailsWar_groovy$run.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
    at _GrailsRun_groovy$run.call(Unknown Source)
    at org.codehaus.gant.IncludeTargets.leftShift(IncludeTargets.groovy:59)
    at org.codehaus.gant.IncludeTargets$leftShift.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
    at _GrailsRun_groovy.run(_GrailsRun_groovy:28)
    at _GrailsRun_groovy$run.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:112)
    at org.codehaus.gant.IncludeTargets.leftShift(IncludeTargets.groovy:59)
    at org.codehaus.gant.IncludeTargets$leftShift.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
    at RunApp.run(RunApp.groovy:25)
    at RunApp$run.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:112)
    at gant.Gant.prepareTargets(Gant.groovy:607)
    at org.codehaus.groovy.grails.cli.GrailsScriptRunner.executeWithGantInstance(GrailsScriptRunner.java:769)
    at org.codehaus.groovy.grails.cli.GrailsScriptRunner.executeScriptFile(GrailsScriptRunner.java:571)
    at org.codehaus.groovy.grails.cli.GrailsScriptRunner.executeScriptWithCaching(GrailsScriptRunner.java:470)
    at org.codehaus.groovy.grails.cli.GrailsScriptRunner.callPluginOrGrailsScript(GrailsScriptRunner.java:414)
    at org.codehaus.groovy.grails.cli.GrailsScriptRunner.executeCommand(GrailsScriptRunner.java:378)
    at org.codehaus.groovy.grails.cli.GrailsScriptRunner.main(GrailsScriptRunner.java:226)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.springsource.loaded.ri.ReflectiveInterceptor.jlrMethodInvoke(ReflectiveInterceptor.java:1254)
    at org.codehaus.groovy.grails.cli.support.GrailsStarter.rootLoader(GrailsStarter.java:235)
    at org.codehaus.groovy.grails.cli.support.GrailsStarter.main(GrailsStarter.java:263)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.springsource.loaded.ri.ReflectiveInterceptor.jlrMethodInvoke(ReflectiveInterceptor.java:1254)
    at org.codehaus.groovy.grails.cli.support.GrailsStarter.rootLoader(GrailsStarter.java:235)
    at org.codehaus.groovy.grails.cli.support.GrailsStarter.main(GrailsStarter.java:263)
Caused by: java.lang.ClassNotFoundException: _GrailsClasspath_groovy$_run_closure1
    at org.codehaus.groovy.tools.RootLoader.findClass(RootLoader.java:175)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at org.codehaus.groovy.tools.RootLoader.loadClass(RootLoader.java:147)
    at org.codehaus.groovy.grails.cli.support.GrailsRootLoader.loadClass(GrailsRootLoader.java:51)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    ... 72 more
| Error Error executing script RunApp: _GrailsClasspath_groovy$_run_closure1

The grails.project.work.dir - which by default would be something like ~/.grails/projects/${appName} had a directory named: "scriptCache"

Emptying the scriptCache contents enabled me to move forward.