解析sourceData报错

**【任务描述】**
private createParser(): BaseDanmakuParser {
    const parser: BaseDanmakuParser = new DanmakuParser();
    const jsonSource = new JSONSource(sourceData);
    parser.load(jsonSource);
    return parser;
  }
解析json的时候报错
Error message:this value undefined
SourceCode:
            throw new Error("this value undefined");
                  ^
Stacktrace:
    at getValue (oh_modules/.ohpm/@ohos+danmakuflamemaster@2.0.1/oh_modules/@ohos/danmakuflamemaster/src/main/ets/components/GlobalContext.ts:42:13)
    at JSONSource (oh_modules/.ohpm/@ohos+danmakuflamemaster@2.0.1/oh_modules/@ohos/danmakuflamemaster/src/main/ets/components/common/master/flame/danmaku/danmaku/parser/ohos/JSONSource.ets:26:31)
    at createParser (entry/src/main/ets/danmuplayer/model/DanmakuVideoPlayer.ets:128:24)
    at danmakuInit (entry/src/main/ets/danmuplayer/model/DanmakuVideoPlayer.ets:997:19)
    at anonymous (entry/src/main/ets/danmuplayer/model/DanmakuVideoPlayer.ets:971:7)
    at (entry/src/main/ets/pages/DanmuVideoPage.ets:57)

点击发送弹幕的时候
Error message:Cannot read property size of undefined
SourceCode:
        item.index = this.danmakuList.size();
                     ^
Stacktrace:
    at addDanmaku (oh_modules/.ohpm/@ohos+danmakuflamemaster@2.0.1/oh_modules/@ohos/danmakuflamemaster/src/main/ets/components/common/master/flame/danmaku/controller/DrawTask.ets:182:18)
    at addDanmaku (oh_modules/.ohpm/@ohos+danmakuflamemaster@2.0.1/oh_modules/@ohos/danmakuflamemaster/src/main/ets/components/common/master/flame/danmaku/controller/DrawHandler.ets:462:7)
    at addDanmaku (oh_modules/.ohpm/@ohos+danmakuflamemaster@2.0.1/oh_modules/@ohos/danmakuflamemaster/src/main/ets/components/common/master/flame/danmaku/ui/widget/DanmakuView.ets:97:7)
    at addDanmaku (oh_modules/.ohpm/@ohos+danmakuflamemaster@2.0.1/oh_modules/@ohos/danmakuflamemaster/src/main/ets/components/common/master/flame/danmaku/ui/widget/DanmakuView.ets:476:7)
    at addDanmaku (entry/src/main/ets/danmuplayer/model/DanmakuVideoPlayer.ets:173:5)
    at anonymous (entry/src/main/ets/danmuplayer/model/DanmakuVideoPlayer.ets:445:13)
    at (entry/src/main/ets/pages/DanmuVideoPage.ets:57)

**【解决方案】**

**【任务来源】**

OpenHarmony-SIG/ohos_danmaku_flame_master

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