It's time for another cryptic grails v1.1.1 stack trace.
I ran into this one when committing a bit change which made the root cause difficult to track down. After much fist shaking and rage, I discovered the issue in my grails-app/conf/Config.groovy file. I had a configuration parameter that I had forgotten to quote which contained a / character.
I fixed the syntax error in Config.groovy and the problem went away.
Here's the stack trace to help confirm you've run into the same issue.
groovy.lang.MissingMethodException: No signature of method: groovy.util.ConfigObject.div() is applicable for argument types: (groovy.util.ConfigObject) values: [[:]]
at Config.run(Config.groovy:41)
at GrailsPackagegroovy$runclosure1.doCall(GrailsPackagegroovy:45)
at GrailsPackagegroovy$runclosure2closure10.doCall(GrailsPackagegroovy:87)
at _GrailsPackagegroovy$runclosure2closure10.doCall(GrailsPackagegroovy)
at _GrailsSettingsgroovy$runclosure10.doCall(GrailsSettingsgroovy:274)
at GrailsSettingsgroovy$runclosure10.call(GrailsSettingsgroovy)
at GrailsPackagegroovy$runclosure2.doCall(GrailsPackagegroovy:86)
at GrailsBootstrapgroovy$runclosure7.doCall(GrailsBootstrapgroovy:140)
at GrailsTestgroovy$runclosure7.doCall(GrailsTestgroovy:249)
at GrailsTestgroovy$runclosure7.doCall(GrailsTestgroovy)
at GrailsTestgroovy$runclosure1closure19.doCall(GrailsTestgroovy:110)
at _GrailsTestgroovy$runclosure1.doCall(GrailsTestgroovy:96)
at TestApp$runclosure1.doCall(TestApp.groovy:66)
at gant.Gant$dispatchclosure4.doCall(Gant.groovy:324)
at gant.Gant$dispatchclosure6.doCall(Gant.groovy:334)
at gant.Gant$dispatchclosure6.doCall(Gant.groovy)
at gant.Gant.withBuildListeners(Gant.groovy:344)
at gant.Gant.this$2$withBuildListeners(Gant.groovy)
at gant.Gant$this$2$withBuildListeners.callCurrent(Unknown Source)
at gant.Gant.dispatch(Gant.groovy:334)
at gant.Gant.this$2$dispatch(Gant.groovy)
at gant.Gant.invokeMethod(Gant.groovy)
at gant.Gant.processTargets(Gant.groovy:495)
at gant.Gant.processTargets(Gant.groovy:480)
Failed to compile configuration file: No signature of method: groovy.util.ConfigObject.div() is applicable for argument types: (groovy.util.ConfigObject) values: [[:]]