Declaration of submitConfigurationForm must be compatible with BlockBase

harlor → credited bhogue → .

I'd wait for the discussion in 🐛 Block Plugins don't store their context mappings on submit Needs work before we merge this - maybe the return type will be removed again...

Hi @harlor,
Steps taken to test the issue and verify the fix:
1. I faced the same issue while installing the module on Drupal 11.2.2.
2. Applied Merge Request #13 from the issue queue.
3. After applying the MR, I was able to install the module without any errors.

Verified that the /admin/structure pages are loading correctly.