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.
language:response_language detectable_format:number_highlighted_sections detectable_format:number_bullet_lists length_constraints:number_words length_constraints:nth_paragraph_first_word keywords:letter_frequency length_constraints:number_sentences
sw
less than
art
at least
l
less than
Please respond to me only in Swahili Make sure to highlight at least 1 sections in your answer with markdown, i.e. use *highlighted section* Your answer must be in the form of exactly 2 bullet points with the format below:
* This is bullet point 1
* This is bullet point 2 Keep your entire response less than 65 words or less. Response should contain exactly 2 paragraphs, and the first paragraph must start with the word "art". Separate paragraphs by double line breaks ("\n\n") In your entire response, the letter l should appear at least 3 times Respond with less than 5 sentences