Suddenly Grails/GGTS is unable to resolve many classes. How to solve it?

Question

I'm using GGTS 3.6.4. I tried to include a class, as normally I do and all dependencies crash. I tried to clean the project, refresh its dependencies and re-compile, but all I have is the error below.

Running the project is useless: IDE just alert me about "Errors in exist required project(s)", then the launching suddently stops, without any alert.

All services are alerting that they are "unable to resolve class", as you can see in the picture. What else could be checked?

EDIT

Action #1: refresh-dependencies > compile:

refresh-dependencies generates in my console |Configuring classpath |Dependencies refreshed.
compile gives me the alert that we can see at the picture

Action #2: clean-all > refresh-dependencies > compile:

clean-all generates |Application cleaned.
refresh-dependencies generates |Installing ([MANY PLUGINS HERE!!!]) |Dependencies refreshed
compile generates |Compiling N source files then there's an error Compilation error: startup failed and the first one is unable to resolve class Transactional. Can this first error holding all compiling process? Then it brings me the alert in the picture.

Action #3: grails run-app --verbose by DOS prompt (Win7) generates:

C:\Grails_IDE\workspace\vs3>grails run-app --verbose
Base Directory: C:\Grails_IDE\workspace\vs3
| 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$run.call(Unknown Source)
        at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSi
teArray.java:45)
        at _GrailsEvents_groovy$run.call(Unknown Source)
        at org.codehaus.gant.IncludeTargets.leftShift(IncludeTargets.groovy:59)
        at org.codehaus.gant.IncludeTargets$leftShift.call(Unknown Source)
        at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSi
teArray.java:45)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCa
llSite.java:108)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCa
llSite.java:116)
        at _GrailsEvents_groovy.run(_GrailsEvents_groovy:32)
        at _GrailsEvents_groovy$run.call(Unknown Source)
        at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSi
teArray.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(CallSi
teArray.java:45)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCa
llSite.java:108)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCa
llSite.java:116)
        at _GrailsClean_groovy.run(_GrailsClean_groovy:29)
        at _GrailsClean_groovy$run.call(Unknown Source)
        at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSi
teArray.java:45)
        at _GrailsWar_groovy$run.call(Unknown Source)
        at org.codehaus.gant.IncludeTargets.leftShift(IncludeTargets.groovy:59)
        at org.codehaus.gant.IncludeTargets$leftShift.call(Unknown Source)
        at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSi
teArray.java:45)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCa
llSite.java:108)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCa
llSite.java:116)
        at _GrailsWar_groovy.run(_GrailsWar_groovy:27)
        at _GrailsWar_groovy$run.call(Unknown Source)
        at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSi
teArray.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(CallSi
teArray.java:45)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCa
llSite.java:108)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCa
llSite.java:116)
        at _GrailsRun_groovy.run(_GrailsRun_groovy:28)
        at _GrailsRun_groovy$run.call(Unknown Source)
        at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSi
teArray.java:45)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCa
llSite.java:108)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCa
llSite.java:112)
        at org.codehaus.gant.IncludeTargets.leftShift(IncludeTargets.groovy:59)
        at org.codehaus.gant.IncludeTargets$leftShift.call(Unknown Source)
        at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSi
teArray.java:45)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCa
llSite.java:108)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCa
llSite.java:116)
        at RunApp.run(RunApp.groovy:25)
        at RunApp$run.call(Unknown Source)
        at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSi
teArray.java:45)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCa
llSite.java:108)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCa
llSite.java:112)
        at gant.Gant.prepareTargets(Gant.groovy:607)
        at org.codehaus.groovy.grails.cli.GrailsScriptRunner.executeWithGantInst
ance(GrailsScriptRunner.java:769)
        at org.codehaus.groovy.grails.cli.GrailsScriptRunner.executeScriptFile(G
railsScriptRunner.java:571)
        at org.codehaus.groovy.grails.cli.GrailsScriptRunner.executeScriptWithCa
ching(GrailsScriptRunner.java:470)
        at org.codehaus.groovy.grails.cli.GrailsScriptRunner.callPluginOrGrailsS
cript(GrailsScriptRunner.java:414)
        at org.codehaus.groovy.grails.cli.GrailsScriptRunner.executeCommand(Grai
lsScriptRunner.java:378)
        at org.codehaus.groovy.grails.cli.GrailsScriptRunner.main(GrailsScriptRu
nner.java:226)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.springsource.loaded.ri.ReflectiveInterceptor.jlrMethodInvoke(Refl
ectiveInterceptor.java:1254)
        at org.codehaus.groovy.grails.cli.support.GrailsStarter.rootLoader(Grail
sStarter.java:235)
        at org.codehaus.groovy.grails.cli.support.GrailsStarter.main(GrailsStart
er.java:263)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.springsource.loaded.ri.ReflectiveInterceptor.jlrMethodInvoke(Refl
ectiveInterceptor.java:1254)
        at org.codehaus.groovy.grails.cli.support.GrailsStarter.rootLoader(Grail
sStarter.java:235)
        at org.codehaus.groovy.grails.cli.support.GrailsStarter.main(GrailsStart
er.java:263)
Caused by: java.lang.ClassNotFoundException: _GrailsClasspath_groovy$_run_closur
e1
        at org.codehaus.groovy.tools.RootLoader.findClass(RootLoader.java:175)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at org.codehaus.groovy.tools.RootLoader.loadClass(RootLoader.java:147)
        at org.codehaus.groovy.grails.cli.support.GrailsRootLoader.loadClass(Gra
ilsRootLoader.java:51)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 72 more
| Error Error executing script RunApp: _GrailsClasspath_groovy$_run_closure1

C:\Grails_IDE\workspace\vs3>

Suddenly Grails/GGTS is unable to resolve many classes. How to solve it?

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