# Warnings and error messages when using mne-qt-browser **URL:** \ **Category:** Support & Discussions\ **Tags:** visualization, qt-browser\ **Created:** [November 5, 2021, 2:54pm UTC](https://mne.discourse.group/t/warnings-and-error-messages-when-using-mne-qt-browser/3915 "2021-11-05T14:54:29Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![PaulF](https://avatars.discourse-cdn.com/v4/letter/p/eb9ed0/32.png) [@PaulF](https://mne.discourse.group/u/PaulF)\ **Post date:** [November 5, 2021, 2:54pm UTC](https://mne.discourse.group/t/warnings-and-error-messages-when-using-mne-qt-browser/3915/1 "2021-11-05T14:54:29Z")
- MNE-Python version: 0.24 - operating system: Mac OS 11.3.1 I just updated to .24 and love the new data browser. I have a question about a warning message I’m receiving along with an error message when using the browser with tkinter. Following the simple example at [GitHub - mne-tools/mne-qt-browser: A new backend for the 2D data browser in MNE-Python](https://github.com/mne-tools/mne-qt-browser), I started with ```python import mne mne.viz.set_browser_backend("pyqtgraph") raw = mne.io.read_raw_edf('myfile.edf',preload=True) raw.plot(block=True,duration=40,start=10) ``` The data browser appears and works fine, but I also receive a warning message: > ```python > RuntimeWarning: PyOpenGL was not found and OpenGL can't be used! > Consider installing pyopengl with "pip install pyopengl". > > ``` I then installed pyopengl and ran the code again, only to obtain an extremely long error message ending with the following: > `ImportError: ('Unable to load OpenGL library', 'dlopen(OpenGL, 10): image not found', 'OpenGL', None)` I then uninstalled pyopengl just so I could at least get things to work. **Question 1:** I don’t really understand the roles of OpenGL and PyOpenGL and whether I should be concerned about this warning and, if I should be, how I can go about resolving it. My second question focuses on embedding raw plots on figure tkinter figure canvases. With the previous raw.plot(), I used the following syntax to do this: ```python import mne from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg import matplotlib.backends.backend_tkagg as tkagg from tkinter import Tk, Frame,TOP,BOTTOM root = Tk() root.wm_title("Main Window") root.geometry('1500x1000') raw = mne.io.read_raw_edf('myfile.edf',preload=True) fig=raw.plot(block=True,duration=40,start=10) canvas_frame=Frame(root,height = 1500,width = 1000) canvas_frame.pack(side=TOP,expand=True) canvas = FigureCanvasTkAgg(fig, master=canvas_frame) canvas.draw() canvas.get_tk_widget().pack(side=TOP,fill=BOTH,expand=1) root.mainloop() ``` This has worked very well for me. However, when I insert `mne.viz.set_browser_backend("pyqtgraph")` so as to place the updated browser on the canvas, I receive the same warning as above, along with a lengthy error message ending with > AttributeError: ‘PyQtGraphBrowser’ object has no attribute ‘set\_canvas’ **Question 2** : Is this error related to the above warning and/or is there some other explanation? I realize mne-qt-browser is a new feature, so please let me know if I should post these questions on its associated github page instead. ---
**Author:** ![PaulF](https://avatars.discourse-cdn.com/v4/letter/p/eb9ed0/32.png) [@PaulF](https://mne.discourse.group/u/PaulF)\ **Post date:** [November 5, 2021, 5:46pm UTC](https://mne.discourse.group/t/warnings-and-error-messages-when-using-mne-qt-browser/3915/2 "2021-11-05T17:46:59Z")
**Update:** I’ve been able to resolve the first issue, which appears to be specific to my Mac Big Sur OS. A description of the problem and a simple solution are outlined at [Unable to import opengl.gl in python on macos - Stack Overflow](https://stackoverflow.com/questions/63475461/unable-to-import-opengl-gl-in-python-on-macos) With regard to placing the mne-qt-browser plot on a canvas, the error message, `AttributeError: ‘PyQtGraphBrowser’ object has no attribute ‘set_canvas’` still results, but only when I close the figure. ---
**Author:** ![drammock](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/drammock/32/4_2.png) [@drammock](https://mne.discourse.group/u/drammock)\ **Post date:** [November 5, 2021, 8:26pm UTC](https://mne.discourse.group/t/warnings-and-error-messages-when-using-mne-qt-browser/3915/3 "2021-11-05T20:26:37Z")
I don’t have the necessary experience with Tk or Qt to tell you the answer, but a quick google search for `embed qt in tk` turns up a couple promising-looking pages: - [How to create a QWidget with a Tk window as parent? | Qt Forum](https://forum.qt.io/topic/29430/how-to-create-a-qwidget-with-a-tk-window-as-parent) - [Tq - Integrate Qt with Tk GUIs • froglogic](https://www.froglogic.com/tq/) ---
**Author:** ![marsipu](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/marsipu/32/196_2.png) [@marsipu](https://mne.discourse.group/u/marsipu)\ **Post date:** [November 7, 2021, 8:21pm UTC](https://mne.discourse.group/t/warnings-and-error-messages-when-using-mne-qt-browser/3915/4 "2021-11-07T20:21:17Z")
Hello Paul, thank you for your hint to the solution of the OpenGl-Problem on MacOs. It is good to know that there can be issues with OpenGL and Big Sur. Martin ---
**Author:** ![richard](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/richard/32/15_2.png) [@richard](https://mne.discourse.group/u/richard)\ **Post date:** [November 8, 2021, 7:36am UTC](https://mne.discourse.group/t/warnings-and-error-messages-when-using-mne-qt-browser/3915/5 "2021-11-08T07:36:33Z")
@PaulF Which version of Python are you using? Could you please share the output of ```python import mne mne.sys_info() ``` Thanks! ---
**Author:** ![PaulF](https://avatars.discourse-cdn.com/v4/letter/p/eb9ed0/32.png) [@PaulF](https://mne.discourse.group/u/PaulF)\ **Post date:** [November 8, 2021, 1:02pm UTC](https://mne.discourse.group/t/warnings-and-error-messages-when-using-mne-qt-browser/3915/6 "2021-11-08T13:02:22Z")
> [@richard](#): > Yes–here it is: Platform: macOS-10.16-x86\_64-i386-64bit Python: 3.9.2 (v3.9.2:1a79785e3e, Feb 19 2021, 09:06:10) [Clang 6.0 (clang-600.0.57)] Executable: /Library/Frameworks/Python.framework/Versions/3.9/bin/python3.9 CPU: i386: 8 cores Memory: 32.0 GB mne: 0.24.0 numpy: 1.21.3 {blas=openblas, lapack=openblas} scipy: 1.7.1 matplotlib: 3.4.2 {backend=MacOSX} sklearn: 0.24.1 numba: Not found nibabel: Not found nilearn: Not found dipy: Not found cupy: Not found pandas: 1.2.4 mayavi: Not found pyvista: Not found pyvistaqt: Not found ipyvtklink: Not found vtk: Not found PyQt5: 5.15.6 ipympl: Not found mne\_qt\_browser: 0.1.6 ---
**Author:** ![mscheltienne](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/mscheltienne/32/827_2.png) [@mscheltienne](https://mne.discourse.group/u/mscheltienne)\ **Post date:** [November 8, 2021, 1:27pm UTC](https://mne.discourse.group/t/warnings-and-error-messages-when-using-mne-qt-browser/3915/7 "2021-11-08T13:27:29Z")
There is a problem with macOS Big sure that moved some standard library elsewhere, and the paths are invalid when using ‘old’ python version. For instance, I run python 3.8.10 and I ran into this problem with multiple third-parties libraries already. Don’t quote me on that, but I think it was solved in Python 3.9.3. So if you upgrade to a more recent 3.9 version, you should not need to patch this with `'/System/Library/Frameworks/OpenGL.framework/OpenGL'`. ---
**Author:** ![richard](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/richard/32/15_2.png) [@richard](https://mne.discourse.group/u/richard)\ **Post date:** [November 8, 2021, 1:46pm UTC](https://mne.discourse.group/t/warnings-and-error-messages-when-using-mne-qt-browser/3915/8 "2021-11-08T13:46:33Z")
> [@mscheltienne](#): > > Don’t quote me on that, but I think it was solved in Python 3.9.3 Yep, this fix def. made it into Python 3.9 and was also backported to 3.8. ---
**Author:** ![mscheltienne](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/mscheltienne/32/827_2.png) [@mscheltienne](https://mne.discourse.group/u/mscheltienne)\ **Post date:** [November 8, 2021, 2:08pm UTC](https://mne.discourse.group/t/warnings-and-error-messages-when-using-mne-qt-browser/3915/9 "2021-11-08T14:08:09Z")
Indeed! Fix in 3.9.7 (I knew I shouldn’t be quoted on 3.9.3 😛) and backported to 3.8.12. ---
**Author:** ![PaulF](https://avatars.discourse-cdn.com/v4/letter/p/eb9ed0/32.png) [@PaulF](https://mne.discourse.group/u/PaulF)\ **Post date:** [November 8, 2021, 2:40pm UTC](https://mne.discourse.group/t/warnings-and-error-messages-when-using-mne-qt-browser/3915/10 "2021-11-08T14:40:13Z")
What about upgrading to 3.10? I just tried this but received the following error when trying to import mne: > import mne > Traceback (most recent call last): > File “\”, line 1, in > import mne > File “/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/mne/ **init**.py”, line 22, in > from .utils import (set\_log\_level, set\_log\_file, verbose, set\_config, > File “/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/mne/utils/ **init**.py”, line 9, in > from .check import (check\_fname, check\_version, check\_random\_state, > File “/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/mne/utils/check.py”, line 21, in > from …fixes import \_median\_complex > File “/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/mne/fixes.py”, line 360, in > ‘preserves\_dtype’: [np.float64], > AttributeError: module ‘numpy’ has no attribute ‘float64’ My version of numpy is up to date. (1.21.4). Perhaps I should go back, uninstall 3.10, and install 3.9.7? ---
**Author:** ![mscheltienne](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/mscheltienne/32/827_2.png) [@mscheltienne](https://mne.discourse.group/u/mscheltienne)\ **Post date:** [November 8, 2021, 3:12pm UTC](https://mne.discourse.group/t/warnings-and-error-messages-when-using-mne-qt-browser/3915/11 "2021-11-08T15:12:49Z")
Python 3.10 is a bit too recent to my liking (minor version 0!), and you will probably encounter a lot of bugs like this one. I would suggest using the latest 3.9 version instead, 3.9.8. ---
**Author:** ![marsipu](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/marsipu/32/196_2.png) [@marsipu](https://mne.discourse.group/u/marsipu)\ **Post date:** [November 12, 2021, 2:42pm UTC](https://mne.discourse.group/t/warnings-and-error-messages-when-using-mne-qt-browser/3915/12 "2021-11-12T14:42:48Z")
@PaulF Concerning your original questions: #### Question 1 We found that OpenGL only enhances performance for some hardware-configurations. Since it also turned out to cause additional problems as in your case, the new default for `use_opengl` is now `False`. To avoid the warning, you can now manually set `use_opengl` to `False`, this won’t be necessary anymore with version 0.24.1 of MNE-Python. #### Question 2 I tried to find a solution for your problem, but unfortunately it seems that [PyQt and tkinter aren’t compatible](https://stackoverflow.com/questions/8497142/python-adding-a-tkinter-graph-to-a-pyqt-widget). What `raw.plot()` returns is an instance of QWidget (or more specific a subclass, QMainWindow) which can be integrated into PyQt-Applications. The `FigureCanvasTkAgg`-Class you use wraps instances of `matplotlib.figure.Figure` to be used with tkinter. I would be glad to help you if you got questions about integrating PyQtBrowser into a PyQt-Application. Otherwise you need to continue using `matplotlib` for your tkinter-application. ---
**Author:** ![PaulF](https://avatars.discourse-cdn.com/v4/letter/p/eb9ed0/32.png) [@PaulF](https://mne.discourse.group/u/PaulF)\ **Post date:** [November 15, 2021, 5:28pm UTC](https://mne.discourse.group/t/warnings-and-error-messages-when-using-mne-qt-browser/3915/13 "2021-11-15T17:28:19Z")
Thanks Martin for looking into this. I very much appreciate it. Given all the matplotlib tools I’ve integrated into my tkinter app at this point, I think I’ll just stick with what I’m doing. In hindsight perhaps I should have utilized PyQt since the start so I could integrate your beautiful data browser into what I’m doing. Thanks again. Paul