function return values changed to x_values and residual error

Status Job ID Name Coverage
  Build
passed #14945
shared-linux
build docs

00:00:50

passed #14946
shared-linux
build linux installer

00:05:25

passed #14947
shared-mac
build mac installer

00:00:38

passed #14948
shared-win
build windows installer

00:03:57

 
  Test
failed #14949
shared-linux
test Linux

00:07:27

failed #14950
shared-mac
test macOS

00:01:21

canceled #14951
shared-win
test Windows

00:25:04

 
Name Stage Failure
failed
test Linux Test There is an unknown failure, please try again

--------------------------------------------------------------------
Your code has been rated at 10.00/10 (previous run: 10.00/10, +0.00)

___________________________________ summary ____________________________________
ERROR: py27: commands failed
ERROR: py36: commands failed
lint: commands succeeded
ERROR: Job failed: exit status 1
failed
test macOS Test

--------------------------------------------------------------------
Your code has been rated at 10.00/10 (previous run: 10.00/10, +0.00)

___________________________________ summary ____________________________________
ERROR: py27: commands failed
ERROR: py36: commands failed
lint: commands succeeded
ERROR: Job failed: exit status 1