报错如下：
TypeError: Cannot read property 'sv' of null
preload.js:55
at Particle2D.__proto.customRender (file:///E:/%E4%B8%89%E6%B6%88/%E5%AE%A2%E6%88%B7%E7%AB%AF/ThreeDismiss2.0/bin/libs/laya.particle.js:1386:35)
at RenderSprite3D.__proto._custom (file:///E:/%E4%B8%89%E6%B6%88/%E5%AE%A2%E6%88%B7%E7%AB%AF/ThreeDismiss2.0/bin/libs/laya.core.js:8548:10)
at RenderSprite3D.RenderSprite._initRenderFun [as _fun] (file:///E:/%E4%B8%89%E6%B6%88/%E5%AE%A2%E6%88%B7%E7%AB%AF/ThreeDismiss2.0/bin/libs/laya.core.js:8755:5)
at Particle2D.__proto.render (file:///E:/%E4%B8%89%E6%B6%88/%E5%AE%A2%E6%88%B7%E7%AB%AF/ThreeDismiss2.0/bin/libs/laya.core.js:18219:42)
at RenderSprite3D.__proto._children (file:///E:/%E4%B8%89%E6%B6%88/%E5%AE%A2%E6%88%B7%E7%AB%AF/ThreeDismiss2.0/bin/libs/laya.core.js:8658:39)
at Sprite.__proto.render (file:///E:/%E4%B8%89%E6%B6%88/%E5%AE%A2%E6%88%B7%E7%AB%AF/ThreeDismiss2.0/bin/libs/laya.core.js:18219:42)
at RenderSprite3D.__proto._children (file:///E:/%E4%B8%89%E6%B6%88/%E5%AE%A2%E6%88%B7%E7%AB%AF/ThreeDismiss2.0/bin/libs/laya.core.js:8658:39)
at BOOM5UI.__proto.render (file:///E:/%E4%B8%89%E6%B6%88/%E5%AE%A2%E6%88%B7%E7%AB%AF/ThreeDismiss2.0/bin/libs/laya.core.js:18219:42)
at RenderSprite3D.__proto._children (file:///E:/%E4%B8%89%E6%B6%88/%E5%AE%A2%E6%88%B7%E7%AB%AF/ThreeDismiss2.0/bin/libs/laya.core.js:8658:39)
at Map.__proto.render (file:///E:/%E4%B8%89%E6%B6%88/%E5%AE%A2%E6%88%B7%E7%AB%AF/ThreeDismiss2.0/bin/libs/laya.core.js:18219:42)
