first rebar3 playtime

[jadams:~/erlang/erlagi] feature/rebar3* 3s ± DEBUG=1 ./rebar3 compile
===> Consult config file "rebar.config"
===> Consult config file "rebar.lock"
===> error function_clause
===> Plugin rebar_covertool not available. It will not be used.

===> Verifying dependencies...
===> Consult config file "/home/jadams/erlang/erlagi/_build/lib/lager/rebar.config"
===> Consult config file "/home/jadams/erlang/erlagi/_build/lib/lager/rebar.lock"
===> Consult config file "/home/jadams/erlang/erlagi/_build/lib/covertool/rebar.config"
===> Consult config file "/home/jadams/erlang/erlagi/_build/lib/covertool/rebar.lock"
===> Uncaught error in rebar_core. Run with DEBUG=1 to see stacktrace
===> Uncaught error: {'EXIT',
                             {undef,
                              [{rebar_app_utils,find,[<<"covertool">>,[]],[]},
                               {rebar_prv_install_deps,maybe_fetch,3,
                                [{file,"src/rebar_prv_install_deps.erl"},
                                 {line,349}]},
                               {rebar_prv_install_deps,
                                '-update_src_deps/9-fun-0-',6,
                                [{file,"src/rebar_prv_install_deps.erl"},
                                 {line,268}]},
                               {lists,foldl,3,
                                [{file,"lists.erl"},{line,1261}]},
                               {rebar_prv_install_deps,update_src_deps,9,
                                [{file,"src/rebar_prv_install_deps.erl"},
                                 {line,240}]},
                               {rebar_prv_install_deps,handle_deps,5,
                                [{file,"src/rebar_prv_install_deps.erl"},
                                 {line,153}]},
                               {rebar_prv_install_deps,'-do/1-fun-0-',2,
                                [{file,"src/rebar_prv_install_deps.erl"},
                                 {line,80}]},
                               {lists,foldl,3,
                                [{file,"lists.erl"},{line,1261}]}]}}