When I try to toggle call flow from fop2 plugin I get error:

[2017-09-06 17:35:57] NOTICE[23396][C-00000eed]: chan_local.c:985 local_call: No such extension/context s@custom-fop2-callflow while calling Local channel
[2017-09-06 17:35:57] NOTICE[23396][C-00000eed]: channel.c:5747 __ast_request_and_dial: Unable to call channel Local/s@custom-fop2-callflow
[2017-09-06 17:35:58] NOTICE[23396][C-00000eed]: chan_sip.c:30073 sip_request_call: Asked to get a channel of unsupported format (nothing) while capability is (gsm|ulaw|alaw|g726)
[2017-09-06 17:35:58] WARNING[23396][C-00000eed]: app_dial.c:2455 dial_exec_full: Unable to create channel of type 'SIP' (cause 58 - Bearer capability not available)
[2017-09-06 17:35:58] WARNING[23396][C-00000eed]: channel.c:5362 set_format: Unable to find a codec translation path from (nothing) to (gsm|ulaw|alaw|g729|g722)
[2017-09-06 17:35:58] WARNING[23396][C-00000eed]: file.c:1017 ast_streamfile: Unable to open all-circuits-busy-now (format (nothing)): Function not implemented
[2017-09-06 17:35:58] WARNING[23396][C-00000eed]: app_playback.c:484 playback_exec: ast_streamfile failed on OutgoingSpoolFailed for all-circuits-busy-now&please-try-call-later, noanswer
[2017-09-06 17:35:58] WARNING[23396][C-00000eed]: channel.c:5362 set_format: Unable to find a codec translation path from (nothing) to (ulaw|alaw|g729|g722)
[2017-09-06 17:35:58] WARNING[23396][C-00000eed]: file.c:1017 ast_streamfile: Unable to open please-try-call-later (format (nothing)): Function not implemented
[2017-09-06 17:35:58] WARNING[23396][C-00000eed]: app_playback.c:484 playback_exec: ast_streamfile failed on OutgoingSpoolFailed for all-circuits-busy-now&please-try-call-later, noanswer
[2017-09-06 17:35:58] WARNING[23396][C-00000eed]: channel.c:5362 set_format: Unable to find a codec translation path from (nothing) to (slin)
[2017-09-06 17:35:58] WARNING[23396][C-00000eed]: indications.c:157 playtones_alloc: Unable to set 'OutgoingSpoolFailed' to signed linear format (write)
[2017-09-06 17:35:58] WARNING[23396][C-00000eed]: channel.c:4861 ast_prod: Prodding channel 'OutgoingSpoolFailed' failed
[2017-09-06 17:35:58] WARNING[23396][C-00000eed]: channel.c:4675 ast_indicate_data: Unable to handle indication 8 for 'OutgoingSpoolFailed'
[2017-09-06 17:35:58] WARNING[23396][C-00000eed]: channel.c:5362 set_format: Unable to find a codec translation path from (nothing) to (slin)
[2017-09-06 17:35:58] ERROR[23396][C-00000eed]: channel.c:8832 ast_channel_start_silence_generator: Could not set write format to SLINEAR

Any suggestions ?