what is config_file in gapFiller

Hello Biostar !
please im trying to do scaffolding step , for this i need to use gapFiller , i just used sspace and i have my scaffold , i tried this command for GapFiller ,

GapCloser –b config_file –a scaffold_file –o output_file

actually i don't undrestand very well what is config file , in the manual i found that it s input library info file name, (required). but still don't know how to create one , i have my contigs file using in sspace and also my reads files ,

Please Help
Thank you