Boa tarde, 
Preciso de ajuda para resolver o problema na criaçao de usuario e permissao no bootstrap, ao executar o app e apresentado a seguinte mensagem:
|Environment set to development
.................................
|Packaging Grails application
...........
|Compiling 2 source files
.Error 
|
Compilation error: startup failed:
C:\Users\Benet\IdeaProjects\tf_allocator\grails-app\conf\BootStrap.groovy: 5: unable to resolve class Permissao 
 @ line 5, column 19.
           Permissao admin = Permissao.findByAuthority("ROLE_ADMIN")
                     ^
C:\Users\Benet\IdeaProjects\tf_allocator\grails-app\conf\BootStrap.groovy: 7: unable to resolve class Permissao 
 @ line 7, column 21.
               admin = new Permissao(authority: "ROLE_ADMIN").save(flush:true)
                       ^
C:\Users\Benet\IdeaProjects\tf_allocator\grails-app\conf\BootStrap.groovy: 9: unable to resolve class Permissao 
 @ line 9, column 19.
           Permissao balcao = Permissao.findByAuthority("ROLE_BALCAO")
                     ^
C:\Users\Benet\IdeaProjects\tf_allocator\grails-app\conf\BootStrap.groovy: 11: unable to resolve class Permissao 
 @ line 11, column 22.
               balcao = new Permissao(authority: "ROLE_BALCAO").save(flush:true)
                        ^
C:\Users\Benet\IdeaProjects\tf_allocator\grails-app\conf\BootStrap.groovy: 14: unable to resolve class Usuario 
 @ line 14, column 17.
           Usuario administrador = Usuario.findByUsername("administrador")
                   ^
C:\Users\Benet\IdeaProjects\tf_allocator\grails-app\conf\BootStrap.groovy: 16: unable to resolve class Usuario 
 @ line 16, column 29.
               administrador = new Usuario(username: "administrador", password: "123",
                               ^
C:\Users\Benet\IdeaProjects\tf_allocator\grails-app\conf\BootStrap.groovy: 20: unable to resolve class Usuario 
 @ line 20, column 17.
           Usuario balconista = Usuario.findByUsername("balconista")
                   ^
C:\Users\Benet\IdeaProjects\tf_allocator\grails-app\conf\BootStrap.groovy: 22: unable to resolve class Usuario 
 @ line 22, column 26.
               balconista = new Usuario(username: "balconista", password: "123",
                            ^
C:\Users\Benet\IdeaProjects\tf_allocator\grails-app\conf\BootStrap.groovy: 29: unable to resolve class UsuarioPermissao 
 @ line 29, column 13.
               new UsuarioPermissao(usuario: administrador, permissao: admin).save(flush:true)
               ^
C:\Users\Benet\IdeaProjects\tf_allocator\grails-app\conf\BootStrap.groovy: 33: unable to resolve class UsuarioPermissao 
 @ line 33, column 13.
               new UsuarioPermissao(usuario: balconista, permissao: balcao).save(flush:true)
               ^
10 errors

Demais classes envolvidas:

//Config.groovy
// Added by the Spring Security Core plugin:
grails.plugin.springsecurity.userLookup.userDomainClassName = 'comum.Usuario'
grails.plugin.springsecurity.userLookup.authorityJoinClassName = 'comum.UsuarioPermissao'
grails.plugin.springsecurity.authority.className = 'comum.Permissao'

grails.plugin.springsecurity.auth.loginFormUrl = '/areaRestrita/logar'
grails.plugin.springsecurity.logout.afterLogoutUrl = '/areaRestrita/logout'
grails.plugin.springsecurity.successHandler.defaultTargetUrl = '/areaRestrita/admin'
grails.plugin.springsecurity.failureHandler.defaultFailureUrl = '/areaRestrita/erro'
grails.plugin.springsecurity.successHandler.alwaysUseDefault = false
grails.plugin.springsecurity.dao.hideUserNotFoundExceptions = false
grails.plugin.springsecurity.adh.errorPage="/j_spring_security_logout"
grails.plugin.springsecurity.password.algorithm = 'SHA-256'

grails.plugin.springsecurity.securityConfigType = "InterceptUrlMap"

grails.plugin.springsecurity.interceptUrlMap = [
'/disciplina/index': ['ROLE_ADMIN'],
'/**': ['IS_AUTHENTICATED_ANONYMOUSLY']
]

grails.plugin.springsecurity.controllerAnnotations.staticRules = [
'/': ['permitAll'],
'/index': ['permitAll'],
'/index.gsp': ['permitAll'],
'/assets/**': ['permitAll'],
'/**/js/**': ['permitAll'],
'/**/css/**': ['permitAll'],
'/**/images/**': ['permitAll'],
'/**/favicon.ico': ['permitAll']
]


//BootStrap 

?

class BootStrap {

def init = { servletContext ->

Permissao admin = Permissao.findByAuthority("ROLE_ADMIN")
if (admin == null){
admin = new Permissao(authority: "ROLE_ADMIN").save(flush:true)
}
Permissao balcao = Permissao.findByAuthority("ROLE_BALCAO")
if (balcao == null){
balcao = new Permissao(authority: "ROLE_BALCAO").save(flush:true)
}

Usuario administrador = Usuario.findByUsername("administrador")
if (administrador == null){
administrador = new Usuario(username: "administrador", password: "123",
enabled: true, accountExpired: false, accountLocked: false,
passwordExpired: false).save(flush:true)
}
Usuario balconista = Usuario.findByUsername("balconista")
if (balconista == null){
balconista = new Usuario(username: "balconista", password: "123",
enabled: true, accountExpired: false, accountLocked: false,
passwordExpired: false).save(flush:true)
}

if (UsuarioPermissao.findByUsuarioAndPermissao(administrador,admin) == null)
{
new UsuarioPermissao(usuario: administrador, permissao: admin).save(flush:true)
}
if (UsuarioPermissao.findByUsuarioAndPermissao(balconista,balcao) == null)
{
new UsuarioPermissao(usuario: balconista, permissao: balcao).save(flush:true)
}

}
def destroy = {

}
}