v-model 循环里绑定变量 报错

<template>  
    <view>  
        <block v-for="(item,index) in inputData" :key="index">  
            <i-input :name='item.name' :title="item.title" :icon='item.icon' v-model="f[item.name]" :error="error[item.name]">  
                <button v-if="index==2" class="cu-btn round bg-green" @click="openWin(index)">验证码</button>  
            </i-input>  
        </block>  

        <i-input name='4name' title="测试" icon='cuIcon-phone text-blue' v-model="f.tel" :error="error.tel">  
            <button  class="cu-btn round bg-green" @click="openWin(index)">验证码</button>  
        </i-input>  

    </view>  
</template>  

<script>  
    import iInput from "@/components/mi/form/iInput.vue";  
    import formGroup from "@/components/mi/form/formGroup.vue";  

    export default {  
        data() {  
            return {  
                f: {  
                    name: '',  
                    tel: '',  
                    add: '中国'  
                },  
                error: {  
                    name: '',  
                    tel: '',  
                    add: ''  
                },  
                inputData: [{  
                        name: 'name',  
                        icon: 'cuIcon-people text-blue',  
                        title: '姓名'  
                    }, {  
                        name: 'tel',  
                        icon: 'cuIcon-phone text-blue',  
                        title: '电话'  
                    },  
                    {  
                        name: 'add',  
                        icon: 'cuIcon-location text-blue',  
                        title: '家庭住址'  
                    }  
                ]  
            }  
        },  
        created() {  
            // console.log('启动了')  
            // 初始值根据后端提供值赋值示例  
        },  
        methods: {  
            openWin(value) {  
                //打开规则或协议页  
                console.log('this.error',value)  
                this.$set(this.error, 'name', '端午节福利')                
            }  
        },  
        components: {  
            iInput,  
            formGroup  
        }  
    }  
</script>