Tiledmap 导出的地图提示说找不到 tilesize

TypeError: Cannot read property '_tileSize' of null
    at proto.uploadData (/Applications/CocosCreator.app/Contents/Resources/engine/bin/modular-cocos2d.js:18734:29)
    at Object._uploadBufferData (/Applications/CocosCreator.app/Contents/Resources/engine/cocos2d/core/renderer/RendererWebGL.js:361:23)
    at Object.rendering (/Applications/CocosCreator.app/Contents/Resources/engine/cocos2d/core/renderer/RendererWebGL.js:474:22)
    at TheClass.cc.DisplayLinkDirector.cc.Director.extend.mainLoop.CC_EDITOR._purgeDirectorInNextLoop (/Applications/CocosCreator.app/Contents/Resources/engine/cocos2d/core/CCDirector.js:1360:21)
    at EditorEngine.tickInEditMode (/Applications/CocosCreator.app/Contents/Resources/app.asar/editor/page/scene-utils/editor-engine/editor-engine.js:1:2497)
    at EditorEngine._tick (/Applications/CocosCreator.app/Contents/Resources/app.asar/editor/page/scene-utils/editor-engine/editor-engine.js:1:5583)

原因找到了, 是我这边的tile里有一层是完全没有tile的。。。