Problem
After installing a Magento 2 module, this error occurs in the checkout:
main.CRITICAL: Broken reference: No element found with ID 'checkout.header.wrapper'
Cause
During installation of the module, some steps were not executed, or errors occurred,
Solution
Please read the installation instructions for Composer in this article.
In addition, follow the instructions from the module's readme file or PDF documentation, and execute all steps exactly as shown there.