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.
startend:quotation change_case:capital_word_frequency detectable_content:number_placeholders language:response_language punctuation:no_comma detectable_format:number_bullet_lists length_constraints:number_paragraphs
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You need to wrap your entire response in double quotes the response should include less than 1 words in all capital letters.In your response, use words with all capital letters less than 1 times Please include at least 2 placeholders represented by square brackets, such as [address] Please respond to me only in Thai Do not include any commas in your response Response must also contain exactly 4 bullet points in markdown format. Use * to indicate bullets, like:
* xyz
* abc
* opq Put the response into at least 5 sections, separated using 3 asterisks ***