Warning: Undefined array key "library" in Drupal\charts\Element\BaseSettings::processSettings()...line 125...\BaseSettings.php

I have the library installed. But I am still getting this error when try to save the graph block in the layout builder.

@hmdnawaz, can you make sure you've saved this page (/admin/config/content/charts), clear caches, and then see if you still have an error?

Yes, I re-installed the module and went to the /admin/config/content/charts and saved and clear the caches.

Still, I'm getting this error.

On /admin/config/content/charts, I do not see any field related to the library.

In web/modules/contrib/charts/src/Element/BaseSettings.php, I printed the $element variable and I see this

The library value is empty.

@hmdnawaz here is an obvious question but I think I ask to get make sure that you did enable at least one of the charts library module? Also can you, please, let us know at what line in web/modules/contrib/charts/src/Element/BaseSettings.php you printed the $element?

Thank you in advance for providing more information about this issue.

Yes I enabled the highcharts module.

I printed the $element variable just before this if statement. Line # 125

if (!empty($element['#library']) && isset($library_options[$element['#library']])) {

Also when I go to the the charts settings page, I don't see the highchart settings there.

Sorry for the delay on this, it took a while to figure out how to replicate it. I think this patch should solve the issue. But let's make sure the tests pass.

Fixed. @hmdnawaz you will need to save the form at /admin/config/content/charts before you will see the Highcharts Settings as one of the horizontal tabs.