NSInternalInconsistencyException Error

[ss2342]

I cloned this repo and tried to run the code via streamlit but keep running into this issue on my Mac:

2023-09-04 11:32:27.017 Python[63562:3191072] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'NSWindow drag regions should only be invalidated on the Main Thread!'

Streamlit will just disconnect

I tried to do a workaround by using docker but I run into a seg fault.

[edsaac]

@Ssingh1997, no clue what NSInternalInconsistencyException is about.

The segfaulting you get in docker is probably due not having a display server. Check below how to start one using pyvista:
https://docs.pyvista.org/version/stable/api/utilities/_autosummary/pyvista.start_xvfb.html

And see here how I got it running on Streamlit Community Cloud, another headless machine.
https://github.com/edsaac/stpyvista-tests/blob/c2305a079a10ac15de96c30291b18809c9c0bd76/%F0%9F%A7%8A_stpyvista.py#L9-L18

[villanuevab]

I get a similar error when attempting to use the example code.

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'NSWindow should only be instantiated on the main thread!' 
***

This is with

import pyvista as pv
pv.start_xvfb()
from stpyvista import stpyvista

## Initialize a plotter object
plotter = pv.Plotter(window_size=[400,400])

## Create a mesh with a cube
mesh = pv.Cube(center=(0,0,0))

## Add some scalar field associated to the mesh
mesh['myscalar'] = mesh.points[:, 2]*mesh.points[:, 0]

## Add mesh to the plotter
plotter.add_mesh(mesh, scalars='myscalar', cmap='bwr', line_width=1)

## Final touches
plotter.view_isometric()
plotter.add_scalar_bar()
plotter.background_color = 'white'

## Pass a key to avoid re-rendering at each time something changes in the page
stpyvista(plotter, key="pv_cube")

[GarrickLin]

got similar error on mac

 You can now view your Streamlit app in your browser.

  Local URL: http://localhost:8501
  Network URL: http://192.168.6.17:8501

2023-10-25 19:20:32.191 python[28750:16576785] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'NSWindow drag regions should only be invalidated on the Main Thread!'
*** First throw call stack:
(
        0   CoreFoundation                      0x0000000198acf154 __exceptionPreprocess + 176
        1   libobjc.A.dylib                     0x00000001985ee4d4 objc_exception_throw + 60
        2   CoreFoundation                      0x0000000198af83a0 _CFBundleGetValueForInfoKey + 0
        3   AppKit                              0x000000019bc9e638 -[NSWindow(NSWindow_Theme) _postWindowNeedsToResetDragMarginsUnlessPostingDisabled] + 320
        4   AppKit                              0x000000019bc8c90c -[NSWindow _initContent:styleMask:backing:defer:contentView:] + 816
        5   AppKit                              0x000000019bc8c5d0 -[NSWindow initWithContentRect:styleMask:backing:defer:] + 48
        6   libvtkRenderingOpenGL2-9.2.dylib    0x000000016c6fbe4c _ZN20vtkCocoaRenderWindow13CreateAWindowEv + 1488
        7   libvtkRenderingOpenGL2-9.2.dylib    0x000000016c78dd5c _ZN21vtkOpenGLRenderWindow5StartEv + 40
        8   libvtkRenderingOpenGL2-9.2.dylib    0x000000016c6fc4c4 _ZN20vtkCocoaRenderWindow5StartEv + 20
        9   libvtkRenderingUI-9.2.dylib         0x00000001561d9488 _ZN30vtkCocoaRenderWindowInteractor10InitializeEv + 64
        10  libvtkRenderingCore-9.2.dylib       0x0000000156f590c0 _ZN15vtkRenderWindow6RenderEv + 148
        11  libvtkRenderingOpenGL2-9.2.dylib    0x000000016c7901d4 _ZN21vtkOpenGLRenderWindow6RenderEv + 112
        12  vtkRenderingOpenGL2.cpython-310-dar 0x000000016c94e850 _ZL30PyvtkOpenGLRenderWindow_RenderP7_objectS0_ + 104
        13  python3.10                          0x00000001007d6bb0 cfunction_call + 96
        14  python3.10                          0x00000001007746c8 _PyObject_MakeTpCall + 136
        15  python3.10                          0x00000001008a7f78 call_function + 380
        16  python3.10                          0x000000010089fd80 _PyEval_EvalFrameDefault + 23352
        17  python3.10                          0x000000010089898c _PyEval_Vector + 392
        18  python3.10                          0x00000001008a7e80 call_function + 132
        19  python3.10                          0x000000010089ee84 _PyEval_EvalFrameDefault + 19516
        20  python3.10                          0x000000010089898c _PyEval_Vector + 392
        21  python3.10                          0x00000001007785dc method_vectorcall + 124
        22  python3.10                          0x00000001008a7e80 call_function + 132
        23  python3.10                          0x000000010089e4b0 _PyEval_EvalFrameDefault + 17000
        24  python3.10                          0x000000010089898c _PyEval_Vector + 392
        25  python3.10                          0x00000001008a7e80 call_function + 132
        26  python3.10                          0x000000010089ee84 _PyEval_EvalFrameDefault + 19516
        27  python3.10                          0x000000010089898c _PyEval_Vector + 392
        28  python3.10                          0x00000001008a7e80 call_function + 132
        29  python3.10                          0x000000010089ee84 _PyEval_EvalFrameDefault + 19516
        30  python3.10                          0x000000010089898c _PyEval_Vector + 392
        31  python3.10                          0x000000010089abf0 _PyEval_EvalFrameDefault + 2472
        32  python3.10                          0x000000010089898c _PyEval_Vector + 392
        33  python3.10                          0x00000001007785dc method_vectorcall + 124
        34  python3.10                          0x00000001008a7e80 call_function + 132
        35  python3.10                          0x000000010089e4b0 _PyEval_EvalFrameDefault + 17000
        36  python3.10                          0x000000010089898c _PyEval_Vector + 392
        37  python3.10                          0x00000001008a7e80 call_function + 132
        38  python3.10                          0x000000010089e4b0 _PyEval_EvalFrameDefault + 17000
        39  python3.10                          0x000000010089898c _PyEval_Vector + 392
        40  python3.10                          0x00000001008a7e80 call_function + 132
        41  python3.10                          0x000000010089e430 _PyEval_EvalFrameDefault + 16872
        42  python3.10                          0x000000010089898c _PyEval_Vector + 392
        43  python3.10                          0x0000000100892d78 builtin_exec + 304
        44  python3.10                          0x00000001007d73e8 cfunction_vectorcall_FASTCALL + 88
        45  python3.10                          0x00000001008a7e80 call_function + 132
        46  python3.10                          0x000000010089e430 _PyEval_EvalFrameDefault + 16872
        47  python3.10                          0x000000010089898c _PyEval_Vector + 392
        48  python3.10                          0x00000001008a7e80 call_function + 132
        49  python3.10                          0x000000010089ee84 _PyEval_EvalFrameDefault + 19516
        50  python3.10                          0x000000010089898c _PyEval_Vector + 392
        51  python3.10                          0x00000001007786e4 method_vectorcall + 388
        52  python3.10                          0x000000010089abf0 _PyEval_EvalFrameDefault + 2472
        53  python3.10                          0x000000010089898c _PyEval_Vector + 392
        54  python3.10                          0x00000001008a7e80 call_function + 132
        55  python3.10                          0x000000010089ee84 _PyEval_EvalFrameDefault + 19516
        56  python3.10                          0x000000010089898c _PyEval_Vector + 392
        57  python3.10                          0x00000001008a7e80 call_function + 132
        58  python3.10                          0x000000010089ee84 _PyEval_EvalFrameDefault + 19516
        59  python3.10                          0x000000010089898c _PyEval_Vector + 392
        60  python3.10                          0x00000001007786e4 method_vectorcall + 388
        61  python3.10                          0x0000000100992e34 thread_run + 172
        62  python3.10                          0x000000010091a32c pythread_wrapper + 48
        63  libsystem_pthread.dylib             0x0000000198977fa8 _pthread_start + 148
        64  libsystem_pthread.dylib             0x0000000198972da0 thread_start + 8
)
libc++abi: terminating due to uncaught exception of type NSException
[1]    28750 abort      streamlit run pyvista_test.py

with the simple code:

def demo():
    # Initialize a plotter object
    plotter = pv.Plotter(window_size=[400, 400])

    # Create a mesh with a cube
    mesh = pv.Cube(center=(0, 0, 0))

    # Add some scalar field associated to the mesh
    mesh['myscalar'] = mesh.points[:, 2]*mesh.points[:, 0]

    # Add mesh to the plotter
    plotter.add_mesh(mesh, scalars='myscalar', cmap='bwr', line_width=1)

    # Final touches
    plotter.view_isometric()
    plotter.add_scalar_bar()
    plotter.background_color = 'white'

    # Pass a key to avoid re-rendering at each time something changes in the page
    stpyvista(plotter, key="pv_cube")

[anabiman]

I am receiving a similar error on mac os v14.2.1:
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'NSWindow should only be instantiated on the main thread!'

• python version: 3.11.7
• panel version: 1.3.8
• streamlit version: 1.30.0
• stpyvista version: 0.0.14
• pyvista version: 0.43.2

[Yemeen]

same thing here with example code on m2 mac, python 3.11.9, PyVista 0.43.8, stpyvista 0.0.17.

[dwromero]

@edsaac Could you please help us out? Has somebody solved the problem?

[edsaac]

This issue appears to be iOS specific so I am not able to replicate it. iOS was just recently added as a supported platform to CPython (PEP 719), so maybe test using the current candidate release for Python 3.13?

Of course, if someone finds a solution to the problem, lmk and I will patch stpyvista accordingly 😉

[Yemeen]

Tried using off screen rendering by setting pv.OFF_SCREEN = True and plotter.off_screen = True, but didn't work.

I also tried forcing rendering on the main thread and using Streamlit's st.cache_resource to ensure plotter creation on the main thread.

Someone with more resources could maybe try a new render method instead of panel.