Uncaught PHP Exception TypeError

i need help to solve the below problem.
Thanks for drupal people

🐛 Regression from #3295790 content-length header set earlier than expected Fixed removed function setContentLengthHeader, which appears to be allowed as some event subscribers are not API → . Your next step is to determine the steps to reproduce. A stack trace will be helpful to you here.

You should search that site's codebase for calls to setContentLengthHeader.