Content creation

Hi everyone,

Please I urgently need your help. I am using H5P on my wordpress. Only Interactive Book is giving me headache. Whenever I add a new interactive book content or update the existing one, it shows "NOT FOUND: Sorry, no posts matched your criteria."

Sometimes it works well and sometimes it displays this error when I click on Create.

Check the picture below

currently building a tool to convert pptx files to h5p, the conversion process is text in slides, images, squares, circles, rectangles, lines. Just run the executable. I'm curious if it contributes anything? Besides, I'm trying to perfect my program, because there are many objects to convert, I only learned how to develop this tool in 3 months.

I try to create content with interactive book. My requirement is that I have to finish page 1 before I can jump to page 2. It should not be possible to jump to any other page. The pages should be done step by step. Does anybody know if this is possible? Of course any other content type is possible, if this requirement is fulfilled.