Errors on amportal a reload

Arch = x86_64
OS = CentOS-6.4 (freepbx)
Asterisk = 11.4.0
FreePBX = 2.11.0.2

I see these pairs of error messages when reloading asterisk:
. . .
[2013-06-24 10:02:29] ERROR[21293]: app_amd.c:431 load_config: Configuration file amd.conf missing.

[2013-06-24 10:02:29] ERROR[21293]: app_amd.c:431 load_config: Configuration file amd.conf missing.
. . .
[2013-06-24 10:02:29] ERROR[21293]: chan_unistim.c:6570 reload_config: Unable to load config unistim.conf

[2013-06-24 10:02:29] ERROR[21293]: chan_unistim.c:6570 reload_config: Unable to load config unistim.conf
. . .
[2013-06-24 10:02:29] ERROR[21293]: pbx_dundi.c:4815 set_config: Unable to load config dundi.conf

[2013-06-24 10:02:29] ERROR[21293]: pbx_dundi.c:4815 set_config: Unable to load config dundi.conf
. . .

The notice and warning messages that I also see I gather relate to modules loaded by Asterisk for which FreePBX provides no configuration files and thus the defaults are used. However, getting error messages is somewhat disturbing. Have I misconfigured something through FreePBX? Are these errors ‘normal’?