Error No client with requested id: sb-portal-cf-dt-approuter!t3664

Tutorials: https://developers.sap.com/tutorials/appstudio-sapui5-create.html
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Hi there ! I need help with step 8.

When I go to URL of the deployed app:

https://65b7d237trial.cpp.cfapps.eu10.hana.ondemand.com/267cc92f-cc40-45e5-ae10-f9f90624e417.sap-btp-sapui52.sapbtpsapui52-1.0.0/

I got an error:

No client with requested id: sb-portal-cf-dt-approuter!t3664

What's wrong?