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There could be several reasons why Vaadin fails to start when compiling the frontend:

1. Incorrect or incomplete setup: This could be due to missing dependencies, incorrect configurations, or outdated versions of software or libraries.

2. Network issues: It's possible that Vaadin cannot connect to the internet or the server it needs to download dependencies from, causing the compilation process to fail.

3. Memory issues: Vaadin requires a minimum amount of memory to compile the frontend. If there is insufficient memory available on the system, the compilation process will fail.

4. Bugs or issues in the code: If there are issues in the code or dependencies, it can lead to compilation failures.

5. Compatibility issues: Different versions of Vaadin, Java, and other dependencies may not be compatible, leading to issues with compilation.

To identify the cause of the issue, it's recommended to check the logs and error messages produced during the compilation process.