# Julia crash with ErrorException("schedule: Task not runnable")

**URL:** <https://discourse.julialang.org/t/julia-crash-with-errorexception-schedule-task-not-runnable/29364>\
**Category:** General Usage\
**Created:** [October 1, 2019, 12:47pm UTC](https://discourse.julialang.org/t/julia-crash-with-errorexception-schedule-task-not-runnable/29364 "2019-10-01T12:47:13Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![essenciary](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/essenciary/32/210469_2.png) [@essenciary](https://discourse.julialang.org/u/essenciary)\
**Post date:** [October 1, 2019, 12:47pm UTC](https://discourse.julialang.org/t/julia-crash-with-errorexception-schedule-task-not-runnable/29364/1 "2019-10-01T12:47:13Z")

</div>

Confusing `throwto` with `yieldto` upsets Julia to the point of self-imploding. Known issue or should I open one?

```julia
julia> up()
Web Server starting at http://127.0.0.1:8000
Web Server running at http://127.0.0.1:8000
Dict{Symbol,Task} with 1 entry:
  :ws => Task (runnable) @0x000000011fe298d0

julia> yieldto(Genie.AppServer.SERVERS[:ws], InterruptException())
fatal: error thrown and no exception handler available.
ErrorException("schedule: Task not runnable")
rec_backtrace at /Users/sabae/buildbot/worker/package_macos64/build/src/stackwalk.c:94
record_backtrace at /Users/sabae/buildbot/worker/package_macos64/build/src/task.c:219
jl_throw at /Users/sabae/buildbot/worker/package_macos64/build/src/task.c:429
error at ./error.jl:33
#schedule#466 at ./task.jl:460
#schedule at ./none:0 [inlined]
notify at ./condition.jl:128
#notify#463 at ./condition.jl:122 [inlined]
notify at ./condition.jl:122 [inlined]
notify at ./condition.jl:122 [inlined]
_uv_hook_close at ./stream.jl:625
jl_apply at /Users/sabae/buildbot/worker/package_macos64/build/src/./julia.h:1614 [inlined]
jl_uv_call_close_callback at /Users/sabae/buildbot/worker/package_macos64/build/src/jl_uv.c:81 [inlined]
jl_uv_closeHandle at /Users/sabae/buildbot/worker/package_macos64/build/src/jl_uv.c:100
uv__finish_close at /workspace/srcdir/libuv/src/unix/core.c:279
uv__run_closing_handles at /workspace/srcdir/libuv/src/unix/core.c:293
uv_run at /workspace/srcdir/libuv/src/unix/core.c:363
jl_run_once at /Users/sabae/buildbot/worker/package_macos64/build/src/jl_uv.c:202
jl_task_get_next at /Users/sabae/buildbot/worker/package_macos64/build/src/partr.c:285
poptaskref at ./task.jl:564
wait at ./task.jl:591
task_done_hook at ./task.jl:327
jl_apply at /Users/sabae/buildbot/worker/package_macos64/build/src/./julia.h:1614 [inlined]
jl_finish_task at /Users/sabae/buildbot/worker/package_macos64/build/src/task.c:176
start_task at /Users/sabae/buildbot/worker/package_macos64/build/src/task.c:606

```