Flash application filesystem
Integrity check on app.image.gz:
Filesystem not programmed
This means in human understandable language: something is wrong with your file app.image.gz.
The md5 checksum of your file differs with the must-have value of the original file.
So some bytes of your file aren't correct, therefore the flash program can't use the file for reflashing.
Just my 2 cents: something got wrong during download of cf-card-contents.zip.
Please redownload cf-card-contents.zip & replace app.image.gz on CF card.
Then it should work.