amazon ec2 - Flask- Cannot read or write to file -

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i using aws ec2 host flask application , trying read , write text file when user submits form using open() function. when form submitted getting error:

internal server error server encountered internal error , unable complete request. either server overloaded or there error in application.

i not sure why error happening.

the code is:
@app.route("/submit", methods=["post"]) 

def submit():      file = open("settingsfile.txt", "w")      file.close()


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