IntelliJ Update -> get Error by lambda

Question

I updated my IntelliJ IDEA this morning and after that I openend my project and suddenly i get an error in my lambda expressions.

First i got this one:

Answer 1

You have configued your Project language level, you need also to configure Module language level. Read more on Configuring Global, Project and Module SDKs.

Go to Project Structure → Module tab (⌘ CMD+; on MacOS or Ctrl+Alt+Shift+S on Windows OS) and check Language level of your module there:

You may also need to change the Java compiler version as well. Go to Settings dialog (⌘ CMD+, on MacOS or Ctrl+Alt+S on Windows OS), navigate through Build, Execution, Deployment → Compiler → Java Compiler (or just type javac in the search box on top) and change Java Compiler version as below: