please, report errors in stderr!!!
Most of the workflow engines (like Cromwell, for instance) expect tools to give error output to stderr instead of stdout, while BUSCO writes errors to STDOUT that makes it hard to track them. An example of stdout error:
INFO ****************** Start a BUSCO 3.0.2 analysis, current time: 11/24/2017 23:17:52 ******************
INFO Configuration loaded from /opt/busco/scripts/../config/config.ini
INFO Init tools...
INFO Check dependencies...
ERROR "hmmsearch" is not accessible, add or modify its path in the config file. Do not include the commmand in the path !
ERROR BUSCO analysis failed !
ERROR Check the logs, read the user guide, if you still need technical support, then please contact mailto:support@orthodb.org