CocosCreator 2.4版本label报错

Creator 2.x
#1

TypeError: Cannot read property ‘_assembler’ of null
at _lineHeight 【…/…/…/…/…/…/Applications/CocosCreator/Creator/2.4.5/CocosCreator.app/Contents/Resources/engine/cocos2d/core/renderer/utils/label/bmfont.js:128:27】
at charCodeAt 【…/…/…/…/…/…/Applications/CocosCreator/Creator/2.4.5/CocosCreator.app/Contents/Resources/engine/cocos2d/core/renderer/utils/label/bmfont.js:176:33】
at horizontalAlign 【…/…/…/…/…/…/Applications/CocosCreator/Creator/2.4.5/CocosCreator.app/Contents/Resources/engine/cocos2d/core/renderer/utils/label/bmfont.js:124:23】
at _updateLabelInfo 【…/…/…/…/…/…/Applications/CocosCreator/Creator/2.4.5/CocosCreator.app/Contents/Resources/engine/cocos2d/core/renderer/utils/label/bmfont.js:114:4】
at charCodeAt 【…/…/…/…/…/…/Applications/CocosCreator/Creator/2.4.5/CocosCreator.app/Contents/Resources/engine/cocos2d/core/renderer/utils/label/bmfont.js:176:33】
at horizontalAlign 【…/…/…/…/…/…/Applications/CocosCreator/Creator/2.4.5/CocosCreator.app/Contents/Resources/engine/cocos2d/core/renderer/utils/label/bmfont.js:124:23】
at _updateLabelInfo 【…/…/…/…/…/…/Applications/CocosCreator/Creator/2.4.5/CocosCreator.app/Contents/Resources/engine/cocos2d/core/renderer/utils/label/bmfont.js:114:4】
at charCodeAt 【…/…/…/…/…/…/Applications/CocosCreator/Creator/2.4.5/CocosCreator.app/Contents/Resources/engine/cocos2d/core/renderer/utils/label/bmfont.js:176:33】
at horizontalAlign 【…/…/…/…/…/…/Applications/CocosCreator/Creator/2.4.5/CocosCreator.app/Contents/Resources/engine/cocos2d/core/renderer/utils/label/bmfont.js:124:23】
at _updateLabelInfo 【…/…/…/…/…/…/Applications/CocosCreator/Creator/2.4.5/CocosCreator.app/Contents/Resources/engine/cocos2d/core/renderer/utils/label/bmfont.js:114:4】

#2

@panda 大佬帮忙看看