I got an issue with Amasty Improved Sorting module. Ijust purchased the module and downloaded it.Then, I just placed the module in app/code/Amasty folder and run command: php bin/magento setup:upgrade and I got the following error.
They provided me a patch for etc/mview.xml file. Some classnames are mismatched in this file. When I applied that patch and ran the command again, same error occurred.