mobile app is not working properly

Hello, im trying to open the mobile application but it tells me that it failed to parse the configuration file. ~/osmocom/osmocom-bb/src/host/layer23/src/mobile# sudo ./mobile Copyright (C) 2010-2015 Andreas Eversberg, Sylvain Munaut, Holger Freyther, Harald Welte Contributions by Alex Badea, Pablo Neira, Steve Markgraf and others License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. <0011> app_mobile.c:451 Failed to parse the configuration file '/root/.osmocom/bb/mobile.cfg' <0011> app_mobile.c:454 Please make sure the file '/root/.osmocom/bb/mobile.cfg' exists, or use an example from 'doc/examples/mobile/' i was searching for the directory /root/.osmocom/bb/ to build the missing file but i cannot find it. Am i blind or where is this folder? it is not in my Home or root directory. Thanks for your help best regards msfu