我创建了war文件并将其部署到tomcat服务器中，但在提交注册页面（具有recaptcha）时发生了此错误，但不是在本地计算机中，也不是在使用GGTS IDE的本地计算机中运行的应用程序中。
以下是生产服务器中发生的错误

errors.GrailsExceptionResolver  - ClassNotFoundException occurred when processing request: [POST] /IFP/signup/completeSignUp
grails.plugins.rest.client.RestBuilder. Stacktrace follows:
java.lang.ClassNotFoundException: grails.plugins.rest.client.RestBuilder
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
    at java.lang.Class.getDeclaredMethods(Class.java:1975)
    at org.codehaus.groovy.util.LazyReference.getLocked(LazyReference.java:46)
    at org.codehaus.groovy.util.LazyReference.get(LazyReference.java:33)
    at com.megatome.grails.recaptcha.ReCaptcha.checkAnswer(ReCaptcha.groovy:171)
    at com.megatome.grails.RecaptchaService.verifyAnswer(RecaptchaService.groovy:147)
    at com.controllers.portal.SignupController.completeSignUp(SignupController.groovy:42)
    at grails.plugin.cache.web.filter.PageFragmentCachingFilter.doFilter(PageFragmentCachingFilter.java:198)
    at grails.plugin.cache.web.filter.AbstractFilter.doFilter(AbstractFilter.java:63)
    at grails.plugin.springsecurity.web.filter.GrailsAnonymousAuthenticationFilter.doFilter(GrailsAnonymousAuthenticationFilter.java:53)
    at grails.plugin.springsecurity.web.authentication.RequestHolderAuthenticationFilter.doFilter(RequestHolderAuthenticationFilter.java:53)
    at grails.plugin.springsecurity.web.authentication.logout.MutableLogoutFilter.doFilter(MutableLogoutFilter.java:62)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

在我看来，这个异常是在执行了captcha之后发生的。请帮助我解决这个问题。