The patcher don't find the address in "libnickel.so.1.0.0" file.
Are you sure you are using "kobo-update-3.19.5761.zip" file and copy it into the 3.19.5761_source/ subdirectory.
Or you changed the 54 line in "libnickel.so.1.0.0.patch" file, patch `Custom reading footer style`.
Code:
find_base_address = `ReadingFooter {\n\tqproperty-footerMargin: 105;\n}\n\n`