Error Compiling to Kindle

Error Compiling with the “…” when trying to compile to Kindle. Also, downloaded Kindle Previewed, compiled as a Ebook and Kindle Previewer had an error trying to open the EPub. This used to work, and now it doesn’'t. HELP!

Basically, I discovered that you must make sure you have the metadata. I had done a “save as” and forgot to retype this part. Yeah… it’s really late…