问Adobe动画ReferenceError:错误#1069:属性loopMode没有在_上找到，并且没有默认值

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ReferenceError: Error #1069: Property loopMode not found on Symbol1 and there is no default value.
at privatePkg::___LayerProp___$/executeFrameHelper()[C:\Program Files\Adobe\Adobe Animate CC 2019\Common\Configuration\Camera\Flash\privatePkg\___LayerProp___.as:87]
at privatePkg::___LayerProp___/executeFrame()[C:\Program Files\Adobe\Adobe Animate CC 2019\Common\Configuration\Camera\Flash\privatePkg\___LayerProp___.as:68]
at Symbol1/applyLayerZdepthAndEffects()[Symbol1::frame1:17]
at Symbol1/frame1()[Symbol1::frame1:10]
at runtime::ContentPlayer/loadInitialContent()
at runtime::ContentPlayer/playRawContent()
at runtime::ContentPlayer/playContent()
at runtime::AppRunner/run()
at ADLAppEntry/run()
at global/runtime::ADLEntry()


ReferenceError: Error #1069: Property loopMode not found on Symbol1 and there is no default value.
at privatePkg::___LayerProp___$/executeFrameHelper()[C:\Program Files\Adobe\Adobe Animate CC 2019\Common\Configuration\Camera\Flash\privatePkg\___LayerProp___.as:87]
at privatePkg::___LayerProp___/executeFrame()[C:\Program Files\Adobe\Adobe Animate CC 2019\Common\Configuration\Camera\Flash\privatePkg\___LayerProp___.as:68]
at privatePkg::___LayerProp___/enterFrame()[C:\Program Files\Adobe\Adobe Animate CC 2019\Common\Configuration\Camera\Flash\privatePkg\___LayerProp___.as:63]
ReferenceError: Error #1069: Property loopMode not found on Symbol1 and there is no default value.
at privatePkg::___LayerProp___$/executeFrameHelper()[C:\Program Files\Adobe\Adobe Animate CC 2019\Common\Configuration\Camera\Flash\privatePkg\___LayerProp___.as:87]
at privatePkg::___LayerProp___/executeFrame()[C:\Program Files\Adobe\Adobe Animate CC 2019\Common\Configuration\Camera\Flash\privatePkg\___LayerProp___.as:68]
at privatePkg::___LayerProp___/enterFrame()[C:\Program Files\Adobe\Adobe Animate CC 2019\Common\Configuration\Camera\Flash\privatePkg\___LayerProp___.as:63]