Matplotlib created a temporary config/cache directory at /tmp/matplotlib-pecq68ey because the default path (/var/www/.config/matplotlib) is not a writable directory; it is highly recommended to set the MPLCONFIGDIR environment variable to a writable directory, in particular to speed up the import of Matplotlib and to better support multiprocessing.
INFO: Reading configuration file /var/www/html/data/material-modeling/Si.cif-QuantumEspresso-herculesd-20250901-112837/config.toml.
INFO: Creating lattice/cell object from /var/www/html/data/material-modeling/Si.cif-QuantumEspresso-herculesd-20250901-112837/Si.cif.
INFO: Primitive cell Si8 -> Si2.
INFO: supercell   = [2 2 2]
INFO: kpoints     = [4 4 4]
INFO: kpts_density= 1024
INFO: directory   = /var/www/html/data/material-modeling/Si.cif-QuantumEspresso-herculesd-20250901-112837
INFO: Si2 Bravais lattice: FCC(a=5.43094); Spacegroup: F d -3 m (227)
INFO: Creating calculator QUANTUMESPRESSO.
INFO: Starting computations in file:///var/www/html/data/material-modeling/Si.cif-QuantumEspresso-herculesd-20250901-112837 [Mon Sep  1 11:28:40 2025]
INFO: Computing ground state.
INFO: Computing electronic density of states.
/usr/lib/python3/dist-packages/plotly/matplotlylib/mpltools.py:460: UserWarning:

'linear' x-axis tick spacing not even, ignoring mpl tick formatting.

/usr/lib/python3/dist-packages/plotly/matplotlylib/mplexporter/exporter.py:87: UserWarning:

Blended transforms not yet supported. Zoom behavior may not work as expected.

/usr/lib/python3/dist-packages/plotly/matplotlylib/renderer.py:510: UserWarning:

Bummer! Plotly can currently only draw Line2D objects from matplotlib that are in 'data' coordinates!

/usr/lib/python3/dist-packages/plotly/matplotlylib/renderer.py:612: UserWarning:

I found a path object that I don't think is part of a bar chart. Ignoring.

INFO: Computing electronic band structure 1d.
INFO: Si2: Ef=6.8810 eV. Gap=584.50 meV.
INFO: Saving results into file:///var/www/html/data/material-modeling/Si.cif-QuantumEspresso-herculesd-20250901-112837 [Mon Sep  1 11:28:46 2025]
INFO: Report available at file:///var/www/html/data/material-modeling/Si.cif-QuantumEspresso-herculesd-20250901-112837/README.html