# NSException for Pyplot
**URL:** https://discourse.julialang.org/t/nsexception-for-pyplot/19391
**Category:** Visualization
**Created:** [January 8, 2019, 3:50pm UTC](https://discourse.julialang.org/t/nsexception-for-pyplot/19391 "2019-01-08T15:50:09Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@ohsonice](https://discourse.julialang.org/u/ohsonice)
#### Post date: [January 8, 2019, 3:50pm UTC](https://discourse.julialang.org/t/nsexception-for-pyplot/19391/1 "2019-01-08T15:50:09Z")
I am getting the following exception when attempting to plot using pyplot:
```julia
julia> using Plots
julia> pyplot()
Plots.PyPlotBackend()
julia> plot(rand(100))
2019-01-08 10:43:51.574 julia[90768:45265541] -[NSApplication _setup:]: unrecognized selector sent to instance 0x7f964ddbdff0
2019-01-08 10:43:51.575 julia[90768:45265541] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSApplication _setup:]: unrecognized selector sent to instance 0x7f964ddbdff0'
*** First throw call stack:
(
0 CoreFoundation 0x00007fff3a4b2fcb __exceptionPreprocess + 171
1 libobjc.A.dylib 0x00007fff61164c76 objc_exception_throw + 48
2 CoreFoundation 0x00007fff3a54ba24 -[NSObject(NSObject) doesNotRecognizeSelector:] + 132
3 CoreFoundation 0x00007fff3a429610 ___forwarding___ + 1456
4 CoreFoundation 0x00007fff3a428fd8 _CF_forwarding_prep_0 + 120
5 libtk8.6.dylib 0x0000000144f7631d TkpInit + 413
6 libtk8.6.dylib 0x0000000144ece17e Initialize + 2622
7 _tkinter.cpython-37m-darwin.so 0x0000000144cf6a0f _tkinter_create + 1183
8 libpython3.7m.dylib 0x0000000129eda2b9 _PyMethodDef_RawFastCallKeywords + 681
9 libpython3.7m.dylib 0x0000000129eda3bd _PyCFunction_FastCallKeywords + 45
10 libpython3.7m.dylib 0x0000000129fe3c4b call_function + 603
11 libpython3.7m.dylib 0x0000000129fdae45 _PyEval_EvalFrameDefault + 7893
12 libpython3.7m.dylib 0x0000000129fd8ad9 _PyEval_EvalCodeWithName + 3305
13 libpython3.7m.dylib 0x0000000129ed91b1 _PyFunction_FastCallDict + 481
14 libpython3.7m.dylib 0x0000000129edaba4 _PyObject_Call_Prepend + 164
15 libpython3.7m.dylib 0x0000000129f425aa slot_tp_init + 298
16 libpython3.7m.dylib 0x0000000129f4bca7 type_call + 295
17 libpython3.7m.dylib 0x0000000129ed9e73 _PyObject_FastCallKeywords + 691
18 libpython3.7m.dylib 0x0000000129fe3cb4 call_function + 708
19 libpython3.7m.dylib 0x0000000129fdaf6c _PyEval_EvalFrameDefault + 8188
20 libpython3.7m.dylib 0x0000000129ed9a6e function_code_fastcall + 254
21 libpython3.7m.dylib 0x0000000129fe3cbe call_function + 718
22 libpython3.7m.dylib 0x0000000129fdae45 _PyEval_EvalFrameDefault + 7893
23 libpython3.7m.dylib 0x0000000129fd8ad9 _PyEval_EvalCodeWithName + 3305
24 libpython3.7m.dylib 0x0000000129ed91b1 _PyFunction_FastCallDict + 481
25 libpython3.7m.dylib 0x0000000129edaba4 _PyObject_Call_Prepend + 164
26 libpython3.7m.dylib 0x0000000129edc5b4 method_call + 36
27 libpython3.7m.dylib 0x0000000129eda5b6 PyObject_Call + 246
28 libpython3.7m.dylib 0x0000000129fdb1b5 _PyEval_EvalFrameDefault + 8773
29 libpython3.7m.dylib 0x0000000129fd8ad9 _PyEval_EvalCodeWithName + 3305
30 libpython3.7m.dylib 0x0000000129ed91b1 _PyFunction_FastCallDict + 481
31 ??? 0x0000000124c9b06a 0x0 + 4912164970
32 ??? 0x0000000124ca4507 0x0 + 4912203015
33 ??? 0x0000000145935508 0x0 + 5462250760
34 libjulia.1.0.dylib 0x000000010b7e4ac3 jl_fptr_trampoline + 51
35 ??? 0x0000000145935416 0x0 + 5462250518
36 libjulia.1.0.dylib 0x000000010b7f54b2 jl_f__apply + 1218
37 libjulia.1.0.dylib 0x000000010b7f594f jl_f__apply_latest + 63
38 ??? 0x00000001459353a5 0x0 + 5462250405
39 libjulia.1.0.dylib 0x000000010b7f54b2 jl_f__apply + 1218
40 ??? 0x000000014593321e 0x0 + 5462241822
41 ??? 0x0000000145933344 0x0 + 5462242116
42 ??? 0x0000000124c7f5e6 0x0 + 4912051686
43 ??? 0x0000000124c8151c 0x0 + 4912059676
)
libc++abi.dylib: terminating with uncaught exception of type NSException
signal (6): Abort trap: 6
in expression starting at no file:0
__pthread_kill at /usr/lib/system/libsystem_kernel.dylib (unknown line)
Allocations: 79194240 (Pool: 79179525; Big: 14715); GC: 175
zsh: abort julia
```
I am using julia 1.0.1 with:
```julia
[91a5bcdd] Plots v0.22.4
[438e738f] PyCall v1.18.5
[d330b81b] PyPlot v2.6.3
```
I would appreciate any help! I have updated and resolved the packages. My thoughts for next steps are just reinstall the packages or julia itself.
Thanks 🙂
---
### Author:  [@ohsonice](https://discourse.julialang.org/u/ohsonice)
#### Post date: [January 9, 2019, 4:36pm UTC](https://discourse.julialang.org/t/nsexception-for-pyplot/19391/2 "2019-01-09T16:36:04Z")
Following the advice here: [PyPlot crashes Julia 1.0.1 on macOS Mojave · Issue #405 · JuliaPy/PyPlot.jl · GitHub](https://github.com/JuliaPy/PyPlot.jl/issues/405),
I ran:
```julia
using Conda
Conda.add("pyqt")
```
This effectively changed the PyPlot backend from `"tkagg"` to `"qt5agg"`. I am on Mac by the way. Not sure if I solved this in the optimal way, but it seems to work for now.