@Amar Agnihotri Thanks for reaching out. As per the application insights screenshot you can see the error
Cannot perform the runtime binding on a null reference so it looks like there is binding configuration issue on your function app code. As you are using storage binding, please refer to this document to validate the configuration for different supported languages and validate the same with your function code.
In case if you still need assistance, please share the sample code along with your binding configuration so I can assist you further.