Did you use
this website? If so, try again, because it displayed several errors and warnings for your file.
Code:
ERROR OEBPS/content.opf 19 3 The content of elements must consist of well-formed character data or markup.
ERROR OEBPS/content.opf - - The content of elements must consist of well-formed character data or markup.
WARNING item (OEBPS/audio/page01.m4a) exists in the zip file, but is not declared in the OPF file
WARNING item (OEBPS/cover.xhtml) exists in the zip file, but is not declared in the OPF file
WARNING item (OEBPS/images/cover.jpg) exists in the zip file, but is not declared in the OPF file
WARNING item (OEBPS/page01.smil) exists in the zip file, but is not declared in the OPF file
WARNING item (OEBPS/images/Thumbs.db) exists in the zip file, but is not declared in the OPF file
WARNING item (OEBPS/Thumbs.db) exists in the zip file, but is not declared in the OPF file
WARNING item (OEBPS/fonts/Booter_5-0.ttf) exists in the zip file, but is not declared in the OPF file
WARNING item (OEBPS/images/background1.jpg) exists in the zip file, but is not declared in the OPF file
WARNING item (OEBPS/page02.xhtml) exists in the zip file, but is not declared in the OPF file
WARNING item (OEBPS/images/background2.jpg) exists in the zip file, but is not declared in the OPF file
WARNING item (OEBPS/css/styles.css) exists in the zip file, but is not declared in the OPF file
WARNING item (OEBPS/toc.ncx) exists in the zip file, but is not declared in the OPF file
WARNING item (OEBPS/page01.xhtml) exists in the zip file, but is not declared in the OPF file
WARNING item (OEBPS/css/page01.css) exists in the zip file, but is not declared in the OPF file
It seems that the errors are caused by comments in the .opf file and the warnings by undeclared files.