It seems like there might be some confusion in your description. The term "exception?HJ" is not familiar in the context of .NET Core technology, and the provided details appear to be incomplete or erroneous. To assist you effectively, could you please provide more specific information about the exception you are encountering? Additionally, if you can share relevant code snippets or error messages, it would greatly aid in identifying and addressing the issue. Remember, the more precise and comprehensive the details you provide, the better I can assist you in troubleshooting the exception within the .NET Core framework.