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.