Why change the admin password in /etc/asterisk/manager.conf ? Our documentation never encourages nor tells you to do so. Doing it will break other tools most probably, as you already find out. You should create a special user for FOP2 as we describe in the online documentation,.. A specific user for FOP2 with its own password and set of permissions. So in fop2.cfg use
manager_user=fop2
manager_secret=whateverSecretYouSetInManager_custom.conf_for_the_fop2_user
So, leave the admin user alone and work with the fop2 user. Be sure to also modify the correct configuration file. If you come from elastix rpm version of FOP2, configuration will default to /etc/asterisk/fop2 and not /usr/local/fop2
The error you show is for the latest FOP2 version (not the one from elastix), so be sure that in /etc/sysconfig/fop2 you do not have -c /etc/asterisk/fop2 as a config parameter, so you can use the stock/default location of /usr/local/fop2 for configuration files and scripts.
