Running python showerror.py returns:

libc++abi.dylib: terminating with uncaught exception of type kiwi::InternalSolverError: Dual optimize failed.

If I change line 305 of LayoutBox.py to

		self.solver.addConstraint((c | 'strong'))

the code runs.

If I run the code with fewer subplots:

fig0, axs = plt.subplots(2,2)

it also works...

Dependencies:

• kiwisolver
• numpy
• matplotlib (>2.0?)

Note, you may need to change the matplotlib backend (matplotlib.use()) depending on your available backends.