Blueprint class of Button can not find Blueprint Function Library按钮类的子蓝图无法获取到蓝图函数库

Every blueprint can get the BFL but the Button blueprint. this button class and BFL is migrated from other project, and in other project ,is work .
其他蓝图都能访问蓝图函数库,除了这个按钮子蓝图,这个按钮子蓝图和蓝图函数库是从其他项目导入的,在其他项目中能获取到蓝图函数库。