500 error received for theme designer

[vladimir_lazic]

We have integration to theme-designer on our application and it worked well and everything looked fine until now. Now we’re having error: “GET request to /comsapuitheming.themedesigner/ completed with status 500 xs-app.json/logout/logoutMethod: Additional properties not allowed” when we try to launch theme-designer. We didn’t have any change in our code. Any idea?

[dsch]

It seems this is the same error as described in SAP Note 3168684 - UI Theme Designer can't be opened in SAP BTP Cloud Foundry. To quote the SAP Note:

Symptom: When you open UI theme designer for your SAP BTP Cloud Foundry application you get an internal server error (response code 500). When you check the app router log you find an error including the information: completed with status 500 xs-app.json/logout/logoutMethod: Additional properties not allowed

Reason and Prerequisites: This problem occurs only when you have implemented the UI theme designer "Developer PaaS Scenario" and when you use in your app an app router version below 10.11.0. Due to a security correction additional properties had to be used in the UI theme designer app router configuration. For applications using the UI theme designer service it is required to use themselves an app router which supports this properties. This is an app router with version 10.11.0 or higher.

Solution: Upgrade the app router of you application to version 10.11.0 or higher and deploy the app.