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Flask 500 Internal Server Error - 7th Video

Alright I don't usually resort to this because I usually find the problem but for the life of me I can't figure this one out I keep getting 500 internal server error and I can't figure out what the problem is. I have copy and pasted all of his code to make sure that everything was what it was supposed to be and I still get the same error whether it's his code or my code. There is a comment on that video, which someone was getting the same error https://www.youtube.com/watch?list=PLQVvvaa0QuDc_owjTbIY4rbgXOFkUYOUB&v=FmfpMLoRjWU and when I remove  this line of code the page works however I dont have my header now.:

 {% extends "header.html" %} 

sentdex replied saying this
To find the error to a 500 error, first, try to run, via the shell, python _init_.py. See if you get an error there. If not, then in the function itself, encase it in a try/except Exception as e:
return str(e)

I'm not quite sure how I would go about doing that. The code for that file is as follows

from flask import Flask, render_template

app = Flask(__name__)

@app.route('/')
def homepage():
    return render_template("main.html")

@app.route('/dashboard/')
def clashboard():
    return render_template("dashboard.html")

if __name__ == "__main__":
    app.run()

any help would be greatly appreciated, thank you!

@app.route('/')
def homepage():
    try:
        return render_template("main.html")
    except Exception as e:
        return str(e)