(If you find progress and other non-error messages irritating, you can use -q to suppress them)

(You can use the -w option to dump extensions.conf format to extensions.conf.aeldump)
LOG: lev:2 file:pbx_ael.c  line:913 func: pbx_load_module  Starting AEL load process.
LOG: lev:2 file:pbx_ael.c  line:920 func: pbx_load_module  AEL load process: calculated config file name './extensions.ael'.
LOG: lev:2 file:pbx_ael.c  line:928 func: pbx_load_module  AEL load process: parsed config file name './extensions.ael'.
LOG: lev:2 file:pbx_ael.c  line:931 func: pbx_load_module  AEL load process: checked config file name './extensions.ael'.
LOG: lev:3 file:pval.c  line:3784 func: add_extensions  This file is Empty!
LOG: lev:2 file:pbx_ael.c  line:933 func: pbx_load_module  AEL load process: compiled config file name './extensions.ael'.
LOG: lev:2 file:pbx_ael.c  line:936 func: pbx_load_module  AEL load process: merged config file name './extensions.ael'.
LOG: lev:2 file:pbx_ael.c  line:939 func: pbx_load_module  AEL load process: verified config file name './extensions.ael'.
LOG: lev:4 file:ael2_parse  line:543 func: main  1 contexts, 0 extensions, 0 priorities