[agugama]

Hi,
I tried to do my first epub but it appeared this message:
BASIC runtime error.
An exception occurred
Type: com.sun.star.packages.zip.ZipIOException
Message: C:/cygwin/home/buildslave/source/libo-core/package/source/zippackage/ZipPackage.cxx:773: Bad Zip File, ZipException: Zip END signature not found!.

And I do not know what can I do.
Can anybody help me please?
Thanks in advance