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An InstanceAlreadyExistsException occurs when there is already an instance of a certain entity in the system, and another attempt is made to create or start it. This can happen in a reactive spring project if you're trying to create a bean that has already been created.

To solve this issue, you can try the following steps:

1. Check your code to ensure that you're not accidentally attempting to create an instance of a bean that already exists.
2. Make sure that you have properly annotated any beans that you are trying to create with the correct scopes. For example, a bean with a singleton scope should only have one instance created throughout the application.
3. Try restarting your application or clearing your application context to see if that resolves the issue.
4. If none of the above steps work, consider using a different bean or reconfiguring your existing beans to prevent multiple instances from being created.

Remember to carefully review your code and application configuration to ensure that you have properly scoped your beans and avoided any potential conflicts that could result in an InstanceAlreadyExistsException.