2017-09-06 20:08:06.963387 [ERR] switch_core_timer.c:117 Timer is not properly configured.

But during freeswitch boots up i not see any timer related errors. This error arise during rxfax application.

I have tested timer using "timer_test" command and log results like

freeswitch@freeswitch1.kazoo> timer_test
Avg: 19.999ms Total Time: 999.999ms

2017-09-06 20:09:50.293389 [CONSOLE] mod_commands.c:955 Timer Test: 1 sleep 20 20000
2017-09-06 20:09:50.313385 [CONSOLE] mod_commands.c:955 Timer Test: 2 sleep 20 20003
2017-09-06 20:09:50.333385 [CONSOLE] mod_commands.c:955 Timer Test: 3 sleep 20 20005
2017-09-06 20:09:50.353384 [CONSOLE] mod_commands.c:955 Timer Test: 4 sleep 20 19995
2017-09-06 20:09:50.373387 [CONSOLE] mod_commands.c:955 Timer Test: 5 sleep 20 19998

Could you advice where to look to find root of issue?