Azure_function_httptrigger (HTTP_ERROR_500)

import logging
import blobstorage
import azure.functions as func
def main(req: func.HttpRequest) -> func.HttpResponse:
logging.info('Python HTTP trigger function processed a request.')

name = req.params.get('name')
if not name:
try:
req_body = req.get_json()
except ValueError:
pass
else:
name = req_body.get('name')

if name:
return func.HttpResponse(f"Hello {name}!")
else:
return func.HttpResponse(
"Please pass a name on the query string or in the request body",
status_code=400
)

import blobstorage is a python, i have imported in __init__.py. everytime i include that i get HTTP 500 error.(VSCode-Python code) can anyone tell the solution for this?