element ui tree组件setCheckedKeys报错

            //打开分配权限对话框
            allocatePerms(row) {
                //获取当前打开的用户所拥有的权限树
                this.$http.get(`menu/checkedTree/${row.roleId}`).then(res => {
                    if (res.data.code !== 1) {
                        return this.$message.error('获取用户权限树失败')
                    }
                    this.permsDialogVisible = true
                    this.$nextTick(()=>{
                        this.$refs.permissionTree.setCheckedKeys(res.data.data)
                    })
                })
            },