[pyngl-talk] Problems with plotting in Jupyter notebook cells

[Karin Meier-Fleischer]

Hi Mark,

sometimes I have similar problems using notebook and PyNGL running with the same preconditions and have to restart the kernel. I don’t know if it is caused by PyNGL because I get other error messages. Is it possible to send the .ipynb file with test data to try to reproduce your errors?

-Karin

> Am 09.07.2019 um 18:52 schrieb Mark England via pyngl-talk <pyngl-talk at ucar.edu>:
> 
> Hi there,
> 
> I am trying to transition to using PyNGL (using Jupiter Notebook, Python v3.7.3) on my Mac (Mojave 10.14.5).
> I am just trying to create simple plots (code below, mostly taken from the examples online. When I run the script first, it works fine and the pdf is created exactly as advertised. All the relevant modules are loaded.
> However if I re-run the plotting section of code in the Notebook, I get this error:
> 
> fatal:["Error.c":406]:ErrorInitialize:Only one instance of ErrorClass is supported
> fatal:Unable to initialize layer-Can't Create
> fatal:Error Creating ErrorClass object
> fatal:Unable to initialize layer-Can't Create
> fatal:Unable to initialize layer-Can't Create
> fatal:_NhlCreate:Unable to access "default" App object
> fatal:_NhlCreate:Invalid Parent id #-4
> fatal:NhlGetValues:PID #-4 is invalid
> fatal:PID #-4 can't be found in NhlSetValues
> warning:maximize_plots: Invalid workstation. No plot maximization can take place.
> fatal:NhlDraw: Invalid Layer Id: -4
> fatal:Unable to update Workstation with PID#-4
> fatal:Unable to clear Workstation with PID#-4
> fatal:NhlDraw: Invalid Layer Id: -4
> fatal:Unable to update Workstation with PID#-4
> fatal:Unable to clear Workstation with PID#-4
> fatal:Unable to Destroy (Bad PID#0)
> 
> I can only get the figure again, if, in the Kernel menu, I ‘restart and run all’. It seems to be a problem with the graphics? I have xQuartz installed. From a similar topic I found online, they removed Ngl.end() at the end, however that doesn’t work for me.
> 
> Thanks,
> 
> Mark
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