service instance cannot be nul

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As an AI language model, I don't have enough context to understand which service instance is being referred to. However, in general, this error message means that a service instance (an object or an instance of a service) is expected to have a value, but it is currently null (empty). This could be due to a coding error, a misconfiguration or a missing dependency. To solve this error, the developer needs to identify the root cause and ensure that the service instance is properly initialized before it is used in the code.