Write a Python program that takes a list of numbers as input from the user, calculates the sum of all even numbers in the list, and returns the result. The program should check if the input is valid (i.e., if it's a list of numbers), and if it's not, it should return an error message. The program should also handle exceptions gracefully and return a user-friendly error message in case of any exceptions. Please respond to me only in Tamil. Please make sure the response less than 3 sentences long. please explicitly add a note starting with P.P.S. The response must contain at least 2 placeholders represented by square brackets. You need to wrap your entire response in double quotes. In your response please avoid using commas. Use words in all capital letters at least 1 times.
punctuation:no_comma length_constraints:number_sentences change_case:capital_word_frequency startend:quotation detectable_content:number_placeholders language:response_language detectable_content:postscript
In your response please avoid using commas Please make sure the response less than 3 sentences long Use words in all capital letters at least 1 times You need to wrap your entire response in double quotes The response must contain at least 2 placeholders represented by square brackets Please respond to me only in Tamil please explicitly add a note starting with P.P.S