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There could be several issues in reaching the Java Fx Application class and running an application, including:

1. Missing or incompatible Java FX runtime environment: In order to run a JavaFX application, you need to have the JavaFX runtime environment installed on your system. If it’s missing or incompatible with the application, you may encounter issues.

2. Incorrect project setup: If the project is not set up correctly, it may not be able to find the JavaFX libraries or the Application class.

3. Classpath issues: If the CLASSPATH environment variable is not set correctly, the JVM may not be able to locate the Application class and other necessary libraries.

4. Dependency issues: If there are missing or incorrect dependencies in the project, it may not be able to run the application.

5. Code issues: If the code itself has errors or is not written correctly, it may not be able to compile or run properly.

6. Security issues: If the application is blocked by the security settings of the operating system or browser, it may not run or may require certain permissions to be granted.