Java errors after vaadin web page (designer) update

System:

Windows10

Java jdk1.8.0_181

Eclipse Oxygen.3

The system runs fine, no compile problems

If I open one vaadin web-page (html) in Ecplise comes this info (message.jpg):

After accept info with “Yes” there are many errors in the associated java files (JavaErrors.jpg):

The version number in the html-Page change from 8.0.5 to 8.1.5:

Knows someone a solution for this problem?

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