Temperature Monitoring using Mailgun (Urgency)

On Ubuntu sensor value is shown but the mail is not sent to me .I am getting the following error -
Error occured; Below are the details;
Excepting value; line 1 column 1(char 0)
I am not able crack this problem .

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@rishabhthakur612 Can you send your code and screenshot?

Facing the same problem.
Here is the code.