Understanding FlighCrew Errors

[yaip]

I am putting n ePub file thru' flight crew and I get errors in opf file, saying, the <item> element's "href" attribute value is "x y z_split_000.htm", which is not a valid URI.

What does that mean? And how do I correct it so that it passes ePub-check in Sigil?

[JSWolf]

You don't want any filenames with spaces in them.

[Jellby]

A space is not allowed in a URI, you should write "%20" instead. But listen to JSWolf and do not use spaces (or any other possibly strange character) in filenames, it will save you headaches.

[Tex2002ans]

A '.' or '_' instead of spaces in filenames is usually the recommended characters to use.

Example:

x y z_split_000.htm

Can be changed to:

x.y.z_split_000.htm
x_y_z_split_000.htm

If there are a large amount of files, you can easily mass rename them using Sigil. Highlight all the files you want renamed in the Book Browser, and then right click -> Rename.

In the box, you can then type:

x.y.z_01

And it will change all highlighted files to:

x.y.z_01.htm
x.y.z_02.htm
x.y.z_03.htm
x.y.z_04.htm
...