The error message ECOM00106 translates to “Error while opening codec for output stream.”
It is entirely possible to create tasks that just don't meet the specs for certain codecs. Please watch for this caveat. Please ensure that the specified parameters (bit rate, audio sampling rate, number of audio channels) meet the needs of the specified codec. For example: when encoding to 3GP format, you should use libamr_nb audio codec with sample rate 8000 Hz, 1 audio channel, and audio bitrate one of: 4.75k, 5.15k, 5.9k, 6.7k, 7.4k, 7.95k, 10.2k or 12.2k