Null Pointer on springSecurityService.currentUser when using weceem grails-plugin

Question

i'm using Grails 2.1.1 in my project, right now i'm using springSecurityService.currentUser to get user credential, etc.

in the past 2 days, my project need some CMS extension and i've stumbled upon Weceem plugins. set things here and there, in the end my project with Weceem plugins is now running, but getting Null Pointer Exception each time the springSecurityService.currentUser method is called.

Without weceem grails-plugin everything is running fine, so i assume there's some settings that i need to make. the question is where and what?

this is my user class

class User {

transient springSecurityService

String username
String password
boolean enabled = true
boolean accountExpired = false
boolean accountLocked = false
boolean passwordExpired = false
Person person

static hasOne = [Person]
static hasMany = [roles: Role]

static constraints = {
    username blank: false, unique: true
    password blank: false
}

static mapping = {
    password column: '`password`'
}

Set<Role> getAuthorities() {
    roles as Set
}

def beforeInsert() {
    encodePassword()
}

def beforeUpdate() {
    if (isDirty('password')) {
        encodePassword()
    }
}

protected void encodePassword() {
    password = springSecurityService.encodePassword(password)
}}

and this is my controller that called the springSecurityService

//show the list of all person
def list = {
    //get all the sorting params
    params.sort = params.sort ?: 'firstName'
    params.order = params.order ?: 'asc'
    params.max = params.max ?: 10
    params.offset = params.offset ?: 0

    def test = springSecurityService.getCurrentUser()

    def personList = Person.createCriteria().list (max: params.max, offset: params.offset) {
        if (springSecurityService.currentUser.person.affiliate.value != 'Admin'){
            eq("affiliate", springSecurityService.currentUser.person.affiliate)
            eq("deleted", false)
        }
        order(params.sort, params.order)
    }
    render view:'list', model:[persons: personList, personTotal: personList.totalCount]
}