This the line where I am getting error in:
It is in server/server.js line 32:
“const MongoStore = connectMongo(session);”
The error is TypeError: Class constructor MongoStore cannot be invoked without ‘new’
Welcome to the forum 
Unfortunately your question lacks any detail - no hint of what library you are using - no context for the code. I suggest you read the Guidelines and then edit your question to give more information about the problem.
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