问使用自定义组价报错 ？

自定义组件报错，

VM79506:2 webviewScriptError

Cannot read property 'replace' of undefined;[Exparser] [Error] [Component] Lifetime Method Error @ wx-cover-view#attached

TypeError: Cannot read property 'replace' of undefined

    at o.attached (http://127.0.0.1:64847/__pageframe__/__dev__/WAWebview.js:8:5912)

    at r.safeCallback (http://127.0.0.1:64847/__pageframe__/__dev__/WAWebview.js:5:27178)

    at r.call (http://127.0.0.1:64847/__pageframe__/__dev__/WAWebview.js:5:26942)

    at t (http://127.0.0.1:64847/__pageframe__/__dev__/WAWebview.js:6:7737)

    at t (http://127.0.0.1:64847/__pageframe__/__dev__/WAWebview.js:6:8050)

    at t (http://127.0.0.1:64847/__pageframe__/__dev__/WAWebview.js:6:7992)

    at t (http://127.0.0.1:64847/__pageframe__/__dev__/WAWebview.js:6:8050)

    at t (http://127.0.0.1:64847/__pageframe__/__dev__/WAWebview.js:6:8050)

    at t (http://127.0.0.1:64847/__pageframe__/__dev__/WAWebview.js:6:8050)

    at t (http://127.0.0.1:64847/__pageframe__/__dev__/WAWebview.js:6:8050)

(anonymous) @ VM79506:2

VM79507:2 [Exparser] [Error] [Component] Lifetime Method Error @ wx-cover-view#attached

(anonymous) @ VM79507:2

VM79508:2 TypeError: Cannot read property 'replace' of undefined

    at o.attached (:64847/__pageframe__/__dev__/WAWebview.js:8)

    at r.safeCallback (:64847/__pageframe__/__dev__/WAWebview.js:5)

    at r.call (:64847/__pageframe__/__dev__/WAWebview.js:5)

    at t (:64847/__pageframe__/__dev__/WAWebview.js:6)

    at t (:64847/__pageframe__/__dev__/WAWebview.js:6)

    at t (:64847/__pageframe__/__dev__/WAWebview.js:6)

    at t (:64847/__pageframe__/__dev__/WAWebview.js:6)

    at t (:64847/__pageframe__/__dev__/WAWebview.js:6)

    at t (:64847/__pageframe__/__dev__/WAWebview.js:6)

    at t (:64847/__pageframe__/__dev__/WAWebview.js:6)

(anonymous) @ VM79508:2

组件如下：

js：

Component({

properties: {

top: {

type: Number,

value: 0

},

left: {

type: Number,

value: 0

},

iconSrc: {

type: String,

value: ''

},

animation: {

type: Object,

value: {}

}

}

});

wxml：

<cover-view class="indicator" style="top:{{top}}rpx; left:{{left}}rpx;" animation="{{animation}}">

<cover-view class="indicator-tip">

<cover-image class="indicator-icon" src="{{iconSrc}}"></cover-image>

<!--a-->

<slot></slot>

</cover-view>

</cover-view>

wxss:

.indicator{

opacity: 0.6;

z-index: 999;

color: white;

font-size: 26rpx;

position: absolute;

background-color: #565A5C;

}

.indicator-tip{

margin: 24rpx 42rpx;

display: flex;

justify-content: space-around;

}

.indicator-icon{

width: 36rpx;

height: 36rpx;

margin-right: 10rpx;

}

json:

{

"component": true

}

组件使用：

json：

{

"disableScroll": true,

"usingComponents": {

"mapindicator": "/pages/components/mapindicator/mapindicator"

}

}

wxml：

<mapindicator top="800" left="" iconSrc="/static/images/clear/clear-all.png">xxxxxxxxxxxxxx</mapindicator>