向电子书制作软件高手请教：编译出的电子书为何无法正常显示？

　　诸位大虾，我用 Natata eBook Compiler v3.3.3 软件制作电子书，打开电子书后却弹出：

　　"Cannot focus a disabled or invisible window"

　　电子书内的目录也能正常显示，我点击目录里任何一章却总是弹出：

　　“请求的资源在使用中”

　　实在搞不懂为何出现上述情况，请高手们不吝赐教！

　　在线等，不胜感激！

　　注：目录能正常显示，但书内章节则显示不出一个字。

　　外国朋友如懂行也可以赐教。谢谢！

　　Hello Friend,

　　I came across one problem. Could you help me? Thanks in advance!

　　The software Natata eBook Compiler v3.3.3 is professional. However,I run the eBook after I compile my novel. A dialogue jumps out.

　　"Cannot focus a disabled or invisible window"

　　Table of content is displayed properly on the left side but when I click on any chapter in the table of content, another dialogue always jumps out.

　　“Materials required are being used.”

　　Could you help me to resolve the problem? Thanks so much!

　　Happy New Year!

　　Best regards!

　　Flare Lu